The answer is d because the ovary's job is twofold. They produce the hormones including estrogen.
Infection, which are antigens that harm your body.
Today in Biology my teacher discussed about Meiosis & sperm cells the other choices were not involved. I would choose that one as it being a reproductive cell.
Snails are asexual they create their own baby's with themselves. they have both parts....thats all ik