The activation-synthesis theory says that: A. dreams are part of the processing of what happened to us during
the day
B. dreams are a by-product of brain activity during sleep.
C. dreams allow us to get rid of things in our brain that we don't need.
D. dreams are a key to our unconscious thought.

if i’m correct, your answer is B.

Explanation:

“the theory that dreams result from the brain's attempt to make sense of random of random neural signals that fire during sleep”

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health

this is true my friend.