Correct Option: B

Go for the second blank first. What is sarcasm? It is saying the opposite of what you mean. One gets sarcastic in order to mock or insult others. Take an example of sarcasm: You meet an ugly girl. She asks you to accompany her. Repelled by her ugliness, you tell her sarcastically, “I don’t go around with beautiful (obviously, you mean ugly!) girls.” Such a statement pinches the girl. A girl whom you have treated with such “pinching sarcasm” will never be friendly or sympathetic to you in future. You have thus alienated her. Those who arethus “pinchingly sarcastic” have a vitriolic tongue. That is, their words are full of bitterness and hate, and so cause a lot of distress and pain.
The correct word is filled in the above given sentence :-
He has a vitriolic tongue; his pinching sarcasm has alienated everyone who has come into contact with him.