Please answer the following question by reasoning step-by-step.
What are cells the basic units of the structure and function of?\nOptions:\n- (A) humans\n- (B) Most plants\n- (C) animals\n- (D) Cell service\n- (E) Organisms\n- (F) mammals\n- (G) Lego cells\n- (H) Buildings

(E)
Cells are the basic units of the structure and function of living things.

An organism is a living thing.

Cells are the basic units of the structure and function of an organism.

.

So, the answer is (E)