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After going all season without getting in the game, Billy's coach called his number to come to bat in the last inning of the last game of the season. Billy was so nervous he could hardly hold on to his bat. Billy's endocrine system is most likely producing larger amounts of what hormones leading to his excitement?

A

insulin

B

thyroxin

C

epinephrine

D

steroids

E

melatonin

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