Which sentence expresses information in the positive form ? a. wendy never cooks. b. wendy does not like to cook. c. wendy doesn't know how to cook at all. d. wendy would rather eat out than cook at home.

The correct answer is D. Wendy would rather eat out than cook at home.
This is the only sentence which is written in the positive form, meaning that it isn't using negative verbs or negative words such as not. In sentence A, the word never creates a negative form. In sentence B, the word not creates a negative form. In sentence C, doesn't is short for does not, which is also negative.