Answer the following question, with explanation first.
What contains most of the energy used by people worldwided?\nOptions:\n- (A) heat\n- (B) Light\n- (C) coal\n- (D) grasses\n- (E) Cooking\n- (F) glucose\n- (G) A computer\n- (H) gasoline

(D)
Grasses supply most of the food consumed by people worldwide.

Because food contains energy.

Grasses supply most of the energy used by people worldwide.

.

Thus, the answer is (D)