What Is the Purpose of Motor Nerve Varicosities as They

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

A) They link the thin filaments to the inside of the sarcolemma in smooth muscle.
B) They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down.
C) They enable each cardiomyocyte to directly stimulate its neighbors.
D) They release neurotransmitter molecules onto smooth muscle cells.
E) They prevent single-unit smooth muscle cells from pulling apart.