Please answer the following question by reasoning step-by-step.
What are attached permanently?\nOptions:\n- (A) Veins and arteries.\n- (B) sensory neurons\n- (C) barnacles\n- (D) tadpoles\n- (E) seahorses\n- (F) alligators\n- (G) adult sponges\n- (H) an organism's body

(G)
Adult sponges are sessile.

Sessile Attached permanently, immobile.

Adult sponges are attached permanently and cannot move.

.

So, the answer is (G)