Which one of the following expressions best illustrates overregularization?
a. that book.
b. doggie.
c. bye-bye.
d. jody goed out.

The correct answer for the question that is being presented above is this one: "D. Jody goed out." The expression that best illustrates overregularization is that Jody goed out. There is no such thing as 'goed' because the past tense of go is went. Overregularization is part of language-learning process where regular words were extended to irregular words.