Episodes of Delirium Are Common with the Ill and the Elderly

Episodes of delirium are common with the ill and the elderly because ____.

A) they are likely to develop delirium with medical illness or surgical procedures
B) their immune systems are compromised and are likely to develop delirium with infection
C) they are susceptible to inflammation of tissues surrounding the brain that cause delirium
D) their skeletal structure deteriorates, which causes loss in cognitive functioning