An agricultural cooperative wants to sell

问题：

An agricultural cooperative wants to sell more of its less popular vegetables, zucchini in particular. A consultant has suggested that the cooperative’s farmers should attempt to market a purple form of zucchini instead of the conventional green form, because people generally dislike green-colored vegetables.
Which of the following, if true, casts the most doubt on the accuracy of the consultant’s assertion ？（）

A. Broccoli and green peas, which are both green vegetables, are among the most popular vegetables in the country.

B. Grapes and eggplants, which both have purple skin, are popular among consumers of all ages.

C. Summer squash, a yellow-colored cousin of the zucchini, is one of the most popular summer vegetables.

D. Green tomatoes are far less popular than red tomatoes.

E. A chewing gum company reports that its purple-colored grape gum is less popular than its green-colored sour apple flavor.