A．the legal privileges granted to foreigners.
B．the excessive hospitality of the American people.
C．the irresponsibility of the officials at border checkpoints.
D．the low efficiency of the Immigration and Naturalization Service.

A．has been serving two contradictory functions.
B．has been too liberal in granting visas to tourists and immigrants indiscriminately.
C．has over-emphasized its service functions at the expense of the nation's security.
D．has ignored the pleas of the two powerful lobbies.