Q: 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: phase changes do not change mass, Fact2: Melting is a phase change., Question: What does not change during melting? (A) Solid (B) Density (C) energy (D) vapors (E) O3 (F) fats (G) Mass (H) Sublimation
A:
G