Question

the root cred means trust or believe. what does the word incredulous mean? unwilling to engage in hostility unwilling to accept something as true unwilling to do harm to others

Explanation:

The root "cred" means trust or believe. The prefix "in - " means not. So "incredulous" should relate to not trusting or not believing. The option "unwilling to accept something as true" matches this as it involves not believing/accepting something as true. The other options are about hostility or harm, which are unrelated to the root "cred".

Answer:

unwilling to accept something as true