Question

what is the one class of large molecule neurotransmitters?
acetylcholine
neuropeptides
cytoplasm
serotonin

Explanation:

Neurotransmitters are chemical messengers in the nervous system. Neuropeptides are a class of large - molecule neurotransmitters, while acetylcholine and serotonin are small - molecule neurotransmitters, and cytoplasm is not a neurotransmitter.

Answer:

B. neuropeptides