Answer: D) Up
Explanation for this question is being written.
Answer: B) The baby ducks waddled down the path.
Answer: B) Preposition
Answer: A) Back
Answer: A) In "to study" , it is part of an infinitive form, not a preposition.
Answer: D) Instead from.
Answer: B) Beside
Answer: C) At
Answer: C) To
Answer: A) Up
Answer: D) In
Answer: B) For