Can someone help me with this question pls

no. dot product   =0 when vecs at right angles

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.