Echolalia means:
a. involuntary movements such as eye tics or arm thrusting.
b. soiling clothing with feces in a person over the age of five.
c. vocalizing vulgar or inappropriate words.
d. repeating words that someone else has said.

The correct answer is D. Repeating words that someone else has said.

Explanation.

The word "Echolalia" mainly used in certain fields of medicine such as psychology and psychiatry refers to the automatic or involuntary repetition of words or vocalizations made by someone else that is part of imitative behavior and mainly occur without awareness. Additionally, echolalia is related to short-term memory and can also be an indicator of autism, schizophrenia, epilepsy and other diseases or disorders and because of this echolalia has been widely studied in medicine. Therefore echolalia means repeating words that someone else has said.