Please answer the following question by reasoning step-by-step.
What body part would be attached to the external framework?\nOptions:\n- (A) heart\n- (B) insects\n- (C) respiratory system\n- (D) wings\n- (E) humans\n- (F) Tail\n- (G) fat\n- (H) digestive system

(D)
Wings are part of the exoskeleton and attached to the thorax.

An exoskeleton is an external framework.

Wings are part of the external framework.

.

Final answer: (D)