Research indicates that 25 percent of U.S.salespeople engaged in business-to-business selling consider it ________ to explicitly ask customers about competitors’ strategies such as pricing practices,product development efforts,and trade and promotion

Research indicates that 25 percent of U.S.salespeople engaged in business-to-business selling consider it ________ to explicitly ask customers about competitors’ strategies such as pricing practices,product development efforts,and trade and promotion programs.
A) essential
B) ineffective
C) unethical
D) counterproductive
E) impolite