Bob works closely with joe and is growing tired of joe's know-it-all attitude. bob has reached his a. vertical relationship. b. feedback threshold. c. irritation threshold. d. mutual reward theory.

According to this sentence, Bob has reached his irritation threshold.

The correct answer is C.

Bob is tired of Joe's "know-it-all" attitude, so he gets irritated, he can't be around his partner anymore. He has reached his limit and can't stand this attitude anymore.

c. when the head chef asks the applicants to make any creative dish they like (i did the usatestprep)

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.