Answer: C) Biked.
Step-by-step explanation: a main verb is the most important verb in the sentence, it is the one that typically shows the action or state of being of the subject. In the given sentence the word that represents the main verb is "biked" (corresponding to the option C) because it is indicating the action that the subject (you) is performing. The other parts of the verb phrase "should have" are helping or auxiliary verbs.