Which Statement Most Accurately Describes Myelin

Which statement most accurately describes myelin?

A) It is a substance that is found in the gray matter in the prefrontal cortex of the brain.
B) It is the fatty sheath that surrounds axons and makes them appear white in images.
C) It is a substance that contributes to less efficient communication between the two hemispheres of the brain.
D) It is the fatty sheath that surrounds the dendrites, leading to an increase in electrical impulses.
E) It is the fatty sheath that surrounds the cell body, making them appear white in images.