If they want to gain loose weight then they would need to eat well, so taking in a normal amount of calories but exercising more. To gain wait, take in more healthy calories but not that much of an extreme work out.. Hope this helps.
Most likely they will gain weight fairly quick, it depends on how many calories they burn in a day though.
I would say c because society doesn’t want you to feel bad for participating in sexual intercourse. They’re more worried about the diseases you could catch
