求解一题

小新和小白9899

For many people, household labor remains demanding even if able to afford household appliances their grandparents would find a miracle.

A.even if able to afford household appliances their grandparents would find a miracle

B.despite being able to afford household appliances their grandparents would find a miracle

C.even if they can afford household appliances their grandparents would have found miraculous

D.although they could afford household appliances their grandparents would find miraculous

E.even if they are able to afford household appliances which would have been a miracle to their grandparents

答案是 C      
C选项中为什么用would have found 的结构呢，对意思上有什么影响吗