D is the answer. Because its the best answer. And because its more healthy to wash your hands before eating because it could have germs or dirt(be dirty) and when you wash them they will be clean but if you didn't your food will get germs and then eat that food and get germs in body then be sick. I hope this helps!
1- I think it's the colon
2- vas deferens
3- prostate gland
4- I believe that is the urethra
5-penis I think
6- epididymis
7- testicles (testes)