Detailed Instructions: 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.
Problem:Which land form is the result of the constructive force of a glacier?
(A) valleys carved by a moving glacier (B) piles of rocks deposited by a melting glacier (C) grooves created in a granite surface by a glacier (D) bedrock hills roughened by the passing of a glacier
Solution:
B