Dramatic Hypotension Sometimes Accompanies Type I Hypersensitivity Reactions,because

Multiple Choice

Dramatic hypotension sometimes accompanies type I hypersensitivity reactions,because

A) massive histamine release from mast cells leads to vasodilation.
B) toxins released into the blood interfere with cardiac function.
C) anaphylaxis results in large volume losses secondary to sweating.
D) hypoxia resulting from bronchoconstriction impairs cardiac function.