The principal part in which the given verb is formed is option C. past. The action word "chewed" comes from its base word "chew". And to make it into a past form, the suffix -ed is added. The action word "chew" is an example of a regular verb. Regular verbs are verbs that only needs the suffix -ed in order to create a past form of the verb.
I think the answer is
either B. past participle or C. Past
Chew is one of the words
that follow the rules for the regular verb where you can add –ed at the end
of the verb as its past form. This is also applies to the past participle of
the verb
