Which bedrock would be the most likely to contain fossils? a. precambrain granite b. cambrian shale c. pleistocene basalt d. middle-proterozoic quartzite?

I could be wrong but I think its B

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.