The word "piecemeal'(Line 5, Para. 2).can be best replaced by "______".

A．Brazil carries out the new security measures as well as U. S.
B．the Brazilian program just aims at U.S. passengers
C．the resultant delays only do harm to American travelers
D．the new measures in Brazil are beneficial to all countries

A．the U.S. thought Brazil had no right to impose any entry formality
B．the long delays at Brazilian airports make U.S. citizens feel very dissatisfied
C．the entry procedures Brazil arranged in the airports are more complex than U.S.
D．the practical effect of those new measures violates the interests of U.S.