For many people, household labor remains demanding even if able to afford household appliances their grandparents would find a miracle.
(GMAT Prep Verbal folder)
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
What's the difference between "even if" and "although?"
I chose D but the key is C. What's wrong with the question D? and another question is what does "they" stand for? I am pretty confused since household labor is singular. Thanks in advance.