The answer is in, choice 1. It is the only preposition that makes sense in that sentence
Actually venting problems with the person may help them understand that you dont like or wont tolerate his or her behavior and can help understand not to do it in the future with other peers. It's never good to be shy and scared please speak up.
The correct answer is "me".
Answer: C
Because throughout the text he talks about how happy he is
