instruction:
You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
question:
What is the first step of the process in the formation of sedimentary rocks?  
 (A) erosion (B) deposition (C) compaction (D) cementation
answer:
A


question:
The drag of wind results in which feature of ocean surface currents?  
 (A) movement of water away from the equator (B) cyclical variations in the height of high tides (C) reduction in velocity with distance from Earth's poles (D) deflection of water toward the direction of airflow
answer:
D


question:
What can a flower become?  
 (A) a fruit (B) a leaf (C) a stem (D) a branch
answer:

A