Final answer:
The scenario where Todd takes a kickboxing class to cope with his unexpressed feelings for Donna illustrates the defense mechanism of sublimation, as he redirects his emotions into a socially acceptable activity.
Step-by-step explanation:
The scenario provided illustrates the defense mechanism of sublimation. Sublimation is a defense mechanism in which unacceptable urges are transformed into more socially acceptable activities or behaviors. Todd is unable to express his romantic feelings towards Donna due to a lack of courage, which may cause him frustration and anxiety.
Instead of acting out in a negative way or suppressing his feelings, he redirects this energy into taking a kickboxing class, a more productive and socially acceptable outlet. This allows him to deal with his emotions by channeling them into improving himself physically, which is a positive transformation of his inner tension.