No choices are given so I'll just list down the reasons why a regular verb is called a regular verb.
1) Its past and participle are the same.
2) Regular verb is a verb whose past tense and past participles are formed by adding -ed or d to the end of the verb.
For example:
Present tense: plan roll dry
Past tense : planned rolled dried
Past Participle : planned rolled dried
*see the past tense and past participle are the same.
Examples of irregular verbs.
Present tense: write break meet
Past tense : wrote broke met
Past Participle: written broken met
*notice that the past and past participle are different. No -ed or d is added to the end of the verb.