I could be the letter C or A
So you're looking for 2 synonyms. B is the best answer, avert and prevent are synonyms of each other. The other choices are antonyms, or they're at least not synonyms.
The word commit has different meaning, and I'll just list some of them:
1.to write something down (commit these ides to paper)
2.to pledge to some position, or to state what you stand on an issue (I asked if he was a participate, but he refused to commit himself.
3. to bind yourself, or to obligate ( commit yourself to a cause)
4. to entrust ( I commit myself to you)
5. to do something, perform an action (to commit murder)
6.to commit to custody (he was committed to prison)
