Teacher: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Teacher: Now, understand the problem? If you are still confused, see the following example:
Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Solution: C
Reason: This is a good example and the output correctly answers the question.

Now, solve this instance: How does erosion impact a river? (A) enlargening (B) warming (C) heightening (D) shrinking
Student:
A
Teacher: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Teacher: Now, understand the problem? If you are still confused, see the following example:
Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Solution: C
Reason: This is a good example and the output correctly answers the question.

Now, solve this instance: How does erosion impact a river? (A) enlargening (B) warming (C) heightening (D) shrinking
Student:
user
A
assistant
Teacher: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Teacher: Now, understand the problem? If you are still confused, see the following example:
Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Solution: C
Reason: This is a good example and the output correctly answers the question.

Now, solve this instance: How does erosion impact a river? (A) enlargening (B) warming (C) heightening (D) shrinking
Student:
A