human
Question: During exercise, adrenaline secretion from the adrenal glands is stimulated by:
A: increased plasma glucose.
B: increased plasma fatty acids.
C: increased plasma ACTH.
D: increased sympathetic nerve activity.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
Yes

--- Answer ---
grounded