A Saprobe Differs from a Parasite in That

A saprobe differs from a parasite in that

A) a saprobe is a fungus, but a parasite can be any type of microbe.
B) a saprobe cannot infect a human, but a parasite is always infectious.
C) a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals.
D) a saprobe does not harm a host that it lives on, whereas a parasite does harm a host.