All of the Following Are Examples of Amplification of a Hormone

All of the following are examples of amplification of a hormone signal except _____.

A) epinephrine initiates an enzyme cascade
B) steroids bind hormone-response elements in the cell and initiate gene transcription
C) 0) 09 mg of growth hormone leads to a 10,000-mg weight gain in a cow
D) different cell types have different receptors capable of binding the same hormone