Which of these sentences is written correctly?

A)
When someone wants to organize his closet, they can find many great space-saving products on infomercials.

B)
When someone wants to organize his closet, he can find many great space-saving products on infomercials.

C)
When someone wants to organize their closet, it can find many great space-saving products on infomercials.

D)
When someone wants to organize their closet, you can find many great space-saving products on infomercials.