Which of the following is the type of scientific explanation most likely used by a molecular biologist

A．The difference between psychology and physiology.
B．The difference between human and animal behavior.
C．How fear would be explained by an psychologist .
D．How scientists differ in their approaches to explain things.

A．through solid objects in space
B．in many different directions
C．further in summer than in winter
D．more slowly than scientists previously believed