When you are driving on a rural two-lane road, you should keep

Answer: B — the right-hand lane clear for vehicles passing.

A is incorrect because keeping one headlight on high beam can blind other drivers and decrease visibility for yourself. C and D are incorrect because you should always drive on the right-hand side of the road in the United States. B is the correct answer because it is important to keep the right-hand lane of a two-lane road clear for vehicles passing, as it allows for efficient and safe passing without disrupting the flow of traffic. Additionally, it is a commonly accepted driving practice to keep to the right side of the road, especially on two-lane roads.