(A) The techniques available for removing asbestos often increase the level of airborne asbestos.

If we take action the only by-product is to release asbestos so is not advisable by the agency to take action

(B) Schools are places where asbestos is especially likely to be released into the air by the action of the occupants.

The stem talks about what the AGENCY must do or not (in this case the suggestion is not to intervene) NOT what the occupant (the students) can cause or not

(C) Children exposed to airborne asbestos run a greater risk of developing cancer than do adults exposed to airborne asbestos.

Silly comparison. Tells nothing about NOT to intervene

(D) The cost of removing asbestos varies from school to school, depending on accessibility and the quantity of asbestos to be removed.

The costs are irrelevant. it is not the real problem here

A is the answer

(E) It is impossible to determine with any degree of certainty if and when construction materials that contain asbestos will break down and release asbestos fibers into the air.

This could be true but does not help us to make a decision to intervene or not