Which of the Following is a Glycol

Question

Which of the following is a glycol?
A) HOCH2CH2CH2OH 
C) HOCH2CH2OH 
D) HOCH2CH2COOH

Accepted Answer

A glycol is a compound with two hydroxyl (-OH) groups attached to adjacent carbon atoms. Choice A and D have a carboxylic acid (-COOH) group instead of a second hydroxyl group, and choice B appears to be a random string of characters. Choice C fits the definition of a glycol with the structure HOCH2CH2OH.