Which of the following comments provides the best example of extrinsic motivation?

A. "I had children-well, had children more or less by accident, not because I planned for it or anything."
B. "Because I have always wanted to be a priest, I study hardest in my philosophy and rhetoric classes."
C. "I work because I love to work and cannot imagine being any different."
D. "Because my employer said our raises would be based on it, I am increasing my number of contract reports."

Answer: D