It is worth considering what makes “convenience” foods so popular and better ones of you

问题补充：

It is worth considering what makes “convenience” foods so popular, and better ones of your own.

A. introduces

B. to introduce

C. introducing

D. introduced

答案：

A. introduces

B. to introduce

(答案→)C. introducing

D. introduced

解析：考查非谓语动词。introducing 和considering 是并列的，用在worth的后面，表示“值得做”。