The focuses on the random electrical energy that the brain produces during REM sleep, possibly as a result of changes in the production of particular neurotransmitters.

The activation-synthesis theory focuses on the random electrical energy that the brain produces during REM sleep, possibly as a result of changes in the production of particular neurotransmitters.

Explanation:

The activation synthesis theory states that dreams don't have a purpose at all, but rather are neural firings ( possibly as a result of changes in the production of particular neurotransmitters ) from the brainstem during REM sleep. To keep us asleep and not wake us up after every impulse , our cerebral cortex associates certain dreams with certain impulses.

This theory was first proposed by Allan Hobson and Robert McCarley.

d would be your answer