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").

Fact1: tectonic plates being pushed together causes earthquakes, Fact2: Several tectonic plates make up the earth's crust that are in a constant state of process., Question: Parts of the Earth's crust being pushed together causes what? (A) magnetic shifts (B) erosion (C) friction (D) earthquakes (E) solar flares (F) moonquakes (G) global warming (H) Sediment
D