Q: Fact 1: Corals form large colonies in shallow tropical water. Fact 2: Coral is the calcite shell of the coral animal. Given the two facts above, what forms large colonies in shallow tropical water?

Available choices:
(a). Most plants.
(b). passenger pigeons.
(c). orchids.
(d). honeybees.
(e). calcite shells.
(f). trout.
(g). sharks.
(h). humans.
The answer is:
(e).