Fact 1: Grasses supply most of the food consumed by people worldwide. Fact 2: Grasses are very distinctive plants. Given the two facts above, most of the food consumed by people worldwide comes from?

OPT:
[I] humans.
[II] trees.
[III] Energy.
[IV] animals.
[V] plants.
[VI] vitamin C.
[VII] honeybees.
[VIII] Earth.
The answer is:
[V]