There are altogether fifty-six students in our c

There are altogether fifty-six students in our class, is a new comer from a faraway mountain village.A.the most hard-working of whoB.of whom the most hard-workingC.the most hard-working of themD.but the most hard-working of whom

B解析考察定语从句，题干中先行词fifty-six students，它在定语从句中的作用是表示范围的状语。

这个问题我还想问问老师呢