Michael was cut from his high school basketball team. He told his friends that he was cut because the coach did not like him, but his close friends know Michael was cut because he hardly ever practiced. In this situation, Michael's excuse is an example of $a(n)$ ____________ frustration, while the fact he despises practicing is an example of $a(n)$ ____________ frustration.
a. personal; external
b. external; personal
c. internal; external
d. personal; internal