Anticholinergic drugs are used:. a) to allow the sympathetic system to dominate. b) to block the parasympathetic system, which is commonly hyperactive. c) as the drugs of choice for treating ulcers. d) to stimulate GI activity.

b) to block the parasympathetic system, which is commonly hyperactive.

Explanation:

to block the parasympathetic system, which is commonly hyperactive. it  block the action of a neurotransmitter called acetylcholine which inhibits nerve impulses responsible for involuntary muscle movements and various bodily functions un the treatment of overactive bladder to chronic obstructive pulmonary disorder.