Rainbows are due to refraction and

refraction through raindrops.
b. reflection from the surface of raindrops.
c. refraction and reflection by raindrops.
d. refraction and reflection by ice crystals.

c. refraction and reflection by raindrops.

A rainbow is a spectrum of colors red, orange, yellow, green, blue, indigo, and violet. A total of seven colors. Rainbows are made by light bending through a medium, such as water or anything clear. when light hits the medium, the light will disperse into different colors other that its white light.