What part of the plant are the most important food producing factories on earth?
a. chloroplasts
b. leaves
c. mosses
d. roots

A. Chloroplasts
B. Leaves
C. Mosses
D. Roots

All of them because chloroplast are in plant cells, plant cells are in the leaves and the roots, and roots and mosses and leaves are the edible parts of the plant where chloroplast exist in making a b c and d all edible.

The answer would be sand and gravel