Critical Reasoning

Source: ManhattanGMAT CAT Verbal Free Online

When airline carriers are able to impose a significant fare increase without deterring many price-sensitive passengers, it is an encouraging sign for the health of the airline industry.

A - When airline carriers are able to impose a significant fare increase without deterring many price-sensitive passengers
B - When airline carriers are able to impose a significant fare increase without deterring many passengers who are price-sensitive
C - When airline carriers may raise fares significantly without it acting as a deterrent to many price-sensitive passengers
D - When airline carriers may raise fares significantly without it deterring many price-sensitive passengers
E - When airline carriers are able to impose a significant fare increase without it deterring many price-sensitive passengers

Here, I am unable to choose between A and B.

By the way, between "many price-sensitive passengers" and "many passengers who are price-sensitive", which one is better.