Li Ming jumps _____ in his class .A.most high B.higher C.high D.the highest选哪个呀?为什么?

Li Ming jumps _____ in his class .A.most high B.higher C.high D.the highest选哪个呀?为什么?
为什么D答案要用THE呀？前面有动词还要加THE吗？那LIMING JUMPS HIGEST对不对呢？