Final answer:
Insulin does not play a direct role in triggering the adolescent musculoskeletal growth spurt. The hormones estrogen and testosterone are responsible for the growth spurt. Therefore, the correct option is d insulin.
Step-by-step explanation:
The hormone that does not play a direct role in triggering the adolescent musculoskeletal growth spurt is insulin. Insulin is primarily involved in regulating blood sugar levels and promoting glucose uptake in cells. On the other hand, the hormones that are responsible for the adolescent growth spurt are estrogen and testosterone, which promote osteoblastic activity and production of bone matrix.