Using the phase diagram shown below, determine which statement best describes what happens as a rock is moved from point A to point B. A) As the rock is moved down in the Earth, it is subjected to higher heat and pressure, and it begins to melt. B) As a rock is moved up in the Earth, it is subjected to slightly lower temperatures and much lower pressures, and it begins to melt. C) As a rock is moved down in the Earth, it is subjected to much higher temperatures, and it begins to melt. D) As the rock is moved up in the Earth, it is subjected to lower temperatures but higher pressures, and it begins to melt.