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

问题补充：

It is worthwhile 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：考查句子结构。Considering短语与introducing短语构成并列关系。故C正确。