Elbert Einstein, for ______ life had once been very hard, wa

A

容易B。原因是受思维定势的影响认为whose life是一个整体。定语从句的主语应该是life， 本句可以改写为: life had once been very hard for him, 所以在定语从句中介词for还缺少了一个宾语。所以A。