The immune system is most effective during ____

Parker says, "I goed to the playground" instead of "I went to the playground." This speech error is best considered an example of:

a. automaticity b. functional subordination c. egocentrism d. overregularization

In the sentence "Bugs Bunny tricked Elmer Fudd," the suffix ed is a ___________

a. function word c. content morpheme b. function morpheme d. tense morpheme