Answer: C) Justin was purpose-driven by this motivation to finish well.
Explanation: one of the uses of a hyphen is when we have to join two words that act like modifiers and, in this way, make clear the meaning of the sentences (sometimes when we have two modifiers the sentence can be misinterpreted), in this case, the option C is the one with two modifiers (purpose and driven), we need a hyphen between those words to join their meanings and make the sentence clear.
