The Purpose of Varicosities in Motor Nerve Fibers in Muscle

The purpose of varicosities in motor nerve fibers in muscle physiology is

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