Which statement gives the correct meaning of the underlined sentence in this paragraph?

Randy had been on a horse only once when he was little and it hadn’t been a good experience. The horse had taken off at a fast trot and Randy had gotten scared. Randy’s friend invited him to go horseback riding with his family, but Randy wasn’t sure he could do it. Once bitten, twice shy.

A.
Friends should try and help us overcome our fears.

B.
Trying something at a young age can be scary.

C.
If something has hurt you, you usually won't do it again.

D.
It’s difficult to tell a friend you’re afraid.
the underlined word is Once bitten, twice shy