The Distinctive Color of a Reflection Nebula Is

The distinctive color of a reflection nebula is

A) blue,caused by the preferential scattering of starlight by very small dust grains.
B) starlight of all colors from cool stars,predominantly in the red part of the spectrum,reflected by ice crystals of water,ammonia,and methane.
C) a mixture of several specific colors coming from fluorescence of atoms excited by ultraviolet radiation emitted by hot stars.
D) red,coming from the emission of light from hydrogen gas.