Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: the surface of a beach is formed by mechanical weathering, Fact2: Sandy and dusty surfaces get hotter during the day, like beach sand., Question: What is a beach formed by? (A) movement of tectonic plates (B) heat change (C) mechanical weathering (D) By coral exoskeletons (E) seasonal changes (F) patch reefs (G) sedimentation (H) Nurseries of the ocean.
A:
C