When you are about to make a turn in direction of a lighted green arrow, which of the following is true?

It's ONLY B. You NEVER turn without checking traffic, although I guess technically you may but only if you are stupid. Also traffic shouldn't really be IN the intersection so C doesn't really apply. IF traffic was really in the intersection then you wait for it to clear the intersection. People tend to misunderstand the term. You are supposed to be AT the intersection, if you are IN the intersection that means you are in the middle of it.