It would better improve the paragraph because it has nothin to do with the rest of the paragraph. The paragraph seems to be about team sports and promoting it, while sentence 3 is about individual sports are better then team sports. So removing sentence three would better promote CO-ED team sports.
D, since the children were seen by their mother. It would be active if their mother saw them.
Answer:
It seems like some natural disaster like earthquake. Which destroyed that person's home. ;-;