It is permitted to make a U-turn to the left:

The correct answer: From a left-turn lane, as well as from any other lane in which there is no sign or marking forbidding a U-turn.

A U-turn to the left is permitted from a left-turn lane, and also from any other lane in which there is no sign or marking forbidding a U-turn. Only an explicit prohibition stops it, and you do not have to be in the leftmost lane.