What doesn't have to be true? It doesn't have to be true that vanilla will continue to be more profitable in the future. The trend might not continue. It also doesn't have to be true that more chocolate ice cream is sold by the industry in general-maybe this company makes a fantastic chocolate ice cream, but some other company makes a much better vanilla. Notice that answer (A) focuses on how popular chocolate ice cream is in general, not just this company's chocolate ice cream. You don't have any information about how popular chocolate ice cream is in general.