As your boss ushers you into his office and closes the door, you experience a strong

As your boss ushers you into his office and closes the door, you experience a strong surge of the fight-or-flight response. but since you can't fight and you can't flee, all of that energy is  pent-up  inside of you with no place to go. you feel like you're going to explode.



  as it is used in this passage, the expression "pent-up" means

a)renowned.b)released.c)held back.d)prohibited.