The longest time that an activity might require best defines

All of the following might be reasonably included in a lender's monthly impound requirements for a borrower, except:

A: Prorated annual payments on a Street Improvement Act bond; B: Property hazard insurance prorations; C: Mortgage interest prorations; D: Property tax prorations.

________ is a defense to Section 2(a) liability, which provides that a seller's price discrimination is not unlawful if the price differential is due to "differences in the cost of manufacture, sale, or delivery" of the product

A) Natural monopoly defense B) Meeting the competition defense C) Changing conditions defense D) Cost justification defense