Which of the Following Is True Regarding Marketing Strategy Planning

Which of the following is true regarding marketing strategy planning?

A) Trends in the external market environment may make a potential opportunity more or less attractive.
B) Marketing managers implement marketing strategies-not marketing plans.
C) The market environment may force marketing managers to change target markets-but their marketing mixes are usually not affected.
D) It is easier in large firms,because marketing managers can count on specialists to plan each of the Four Ps.
E) All these answers are correct.