Question

the root cred means trust or believe. what does the word incredulous mean?
unwilling to accept something as true
unwilling to speak out in a situation
unwilling to engage in hostility

Explanation:

The root "cred" means trust or believe. The prefix "in - " often means "not". So "incredulous" should relate to not believing. The first option "unwilling to accept something as true" matches this as it's about not accepting (not believing) something as true. The second option is about speaking out, and the third is about hostility, which don't relate to the root "cred".

Answer:

unwilling to accept something as true