Answer:
Skinny
Step-by-step explanation:
Our task is to choose the word that has the same or similar meaning as the word gaunt used in the sentence Several women's rights groups have criticized models for being too gaunt. Words or phrases from the same language that have identical or similar meanings are called synonyms.
The adjective gaunt, when referring to a person, has the meaning very thin, especially because of sickness, hunger, or age. Out of the listed options, the only word with a similar meaning is skinny, so that is the correct answer.