Security concerns have prompted the federal departments of State and Homeland Security to

tighten the process for issuing visas and to impose rigorous new monitoring procedures for many international students once they enter the United States. Colleges have struggled to comply with new reporting requirements and deal with admitted students whose entry into the country has been delayed by the new procedures.

One result of these problems has been a renewed discussion of the presence of substantial numbers of international students on U.S. campuses. Anecdotal reports suggest that the number of new international students entering the United States is declining.

The downward trend is consistent with data on the number of student visas being issued by the State Department. Applications by Arab and Muslim men and those of any student seeking to study science had to be sent to Washington for review, and men from 25 countries identified as potential harbors for terrorism face new registration requirements once they enter the United States.

These procedures led to long lines at U.S. consulates around the world and to many well-publicized situations in which students were unable to reach their intended campus in time for the opening of classes last autumn.

One continuing problem, university officials say, is that U.S. consulates no longer routinely renew visas for international students whose visas expire while they are home for vacations or other short visits.

The issue of whether some students will continue to view the United States as a desirable place to study has also become a source of discussion. John Shull, college adviser at the Cairo American College, said, "We are seeing more of our students looking at non-U.S, universities." Lynch of Penn State said that his university is now getting "very few new students from the Middle East—especially males".

Stricter U.S. restrictions on foreign students studying in America and delays in processing visa requests appear to be doing part of the job for the British. Applications to British universities from foreign students have surged in the last year, particularly from countries with predominantly Muslim populations.

Among countries sending significant numbers of students to Britain, the biggest increases in applications were from Saudi Arabia. Education officials did not provide reasons for this striking pattern. But some individual universities said there were indications that new U.S. regulations and stricter enforcement were playing at least some role. In Britain, students can also get an education in English, at internationally known universities, but perhaps with a bit less hassle.

Officials said that, while Britain did not impose new regulations on students seeking visas to study here, enforcement of existing rules and scrutiny of applications may have been stepped up. Admissions authorities say they have had more contact with the police, and they are being more diligent about requiting students to leave the country once their visas expire.

Still, either out of choice or necessity, some students apparently are finding Britain to be a more attractive option than the United States.

Why U.S. imposes so much on international students？

A．Because the new reporting requirements demand so.

B．There is a large number of international students on U.S. campuses.

C．Because of its concern of civil security.

D．There are too many students applying to study in U.S.