Use reasoning to answer the following question.
What kind of species are seahorses?\nOptions:\n- (A) horse\n- (B) seaweed\n- (C) edible\n- (D) marine\n- (E) a fish\n- (F) shellfish\n- (G) strong\n- (H) food

(D)
Marine species live mainly in shallow coastal waters.

Seahorses inhabit shallow coastal waters, especially seagrass beds, coral reefs and mangrove swamps.

Seahorses are marine species.

.

The final answer: (D)