Caroline acts strangely and it interferes with her life. she uses an old grocery cart to collect trash from the street. she wears multiple layers of clothing even when it is hot outside. she frequently talks to herself in public. caroline is most likely

Caroline is most likely a schizophrenic as explained by her disorganized behavior.

Symptoms of the mental disorder, schizophrenia, include, hallucinations, lack of emotional expression, catatonia, disorganized behavior, etc.. Disorganized behavior involves unexpected, strange and chaotic behavior such as talking to oneself, dressing strangely, behaving bizarrely, lack of self-care and limited awareness of one's surroundings and environment. 

The answer should be a.