Answer:
Your friend bakes cookies with ingredients specified by a recipe and sells them to neighbors is the correct answer.
Step-by-step explanation:
Basic economic questions are three:
1) What to produce? (the cookies, in this case)
2) How to produce? (by using the recipe)
3) For whom to produce? (in the question, the answer would be for the neighbors.)
Due to this, the correct answer is the one provided above.