Which of the Following Is True of U

Which of the following is true of U.S.government market buying?

A) A buyer may order from a supplier on the "approved list" at a previously set price without asking for new bids.
B) Most buyers write specs so that only one brand or supplier qualifies.
C) It is illegal for a salesperson to try to influence the writing of product specifications.
D) Most buyers buy by inspection,since they are expected to spend money wisely.
E) None of these answers is correct.