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: if an object in a fluid is more dense than that fluid then that object will sink in that fluid because of gravity, Fact2: Waves can be created at the boundary between fluids of different densities., Question: objects will sink between boundaries with different what due to gravity (A) Energy. (B) surfaces (C) densities (D) forces (E) rocks (F) minerals (G) energy (H) heat energy
A:
C