PT 59 S3 Q12

To cut costs, a high school modified its air-conditioningsystem to increase ... ...

The argument depends on assuming which one of the following?
(A) At least some of the visits to the school nurse after the system was modified were due to illness.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Dec. '09 LSAT (PT 59 Sec. 3)