Its not C. You would think it would but its not. I feel like its A or B.
It is D, sharing appreciation for what is being said. Both A and B aren't crucial to being a good listener, in fact in practice they effectively draw attention to yourself, which would be fine if the question was regarding being a good conversationalist. Additionally, C is just completely irrelevant, that wouldn't even be a good conversation practice, let alone a trait important to listening.
During weight training, you should exhale during he concentric phase or when you're doing the hardest work.
Factors That Affect BAC
-Body size
-Biological sex
-Physical condition
-Medications you take
-What you've eaten (and when)
-How much sleep you've had
-Alcohol content of your drinks