Hortense was asked by the local recreation board to conduct a study to determine how interested the public would be in having more recreational facilities. Specifically, he was asked to determine the balance of the expenses of the additional facilities to the specific level of increased usage of the facilities. Hortense was engaged in:

a) cost-benefit analysis.

b) social indicators research.

c) computer simulations.

d) logistical problems.

e) public opinion research.