The correct answer is D) less valve gear wear. The cam with tangential flanks (straight sides) will result in less valve gear wear compared to the cam with convex flanks. This is because the tangential flanks produce a smoother, more gradual opening and closing of the valve, resulting in less stress and wear on the valve train components. In contrast, the convex flanks create a more abrupt valve action, which can lead to increased wear on the valve seats, springs, and other valve gear components. The other answer choices are incorrect: A) less valve seat wear - The cam with tangential flanks actually causes less valve gear wear, not specifically less valve seat wear. B) greater valve lift - The type of cam flank does not directly affect the valve lift. C) more abrupt valve action - This is incorrect, as the cam with tangential flanks produces a more gradual, less abrupt valve action.