Which of the Following Best Describes the Conditions of Contact

Which of the following best describes the conditions of contact metamorphism?

A) Pressures are very high, the rock is deeply buried, and temperatures are raised gradually by Earth's internally generated heat.
B) Pressures are fairly low, the rock is in the upper part of the crust, the heat for baking the neighbouring rocks is supplied quickly from the intrusion of a nearby magma body.
C) Heat is generated very quickly by shearing and mechanical movements along faults.
D) Depths are so deep and temperatures are so high that the rocks begin to partially melt.