Which of the following lists demonstrates various tenses of an irregular verb?
a. i call, i called, i will call
b. i walk, i walked, i will walk
c. i try, i tried, i will try
d. i go, i went, i will go

An irregular verb is a verb that does not have regular forms, that is forms formed by stem+ed, such as for example:

Walk+ed: the regular past tense of walk is walked.

Here the irregular verb is "go" - the correct answer is D. I go, I went, I will go.

The other options show regular verbs.