Which choice best describes the following sentence?

cal earned extra credit in science class by volunteering at the aquarium on weekends.

it is a complete and correct sentence.
it features a comma splice.
it is a fused sentence.
it is a rambling sentence.

The sentence is a complete and correct sentence. Option A is correct.

A complete sentence is made up of three elements: a subject, verb, and an object. The subject is usually a noun or a pronoun. Besides, since there's a subject, there will be a verb due to the fact that all verbs need a subject. What is more, the object of a sentence is the element that acts upon by the subject. Moreover, sometimes commas play an importal role in a complete sentence.

resents dr jekyll

explanation:

that is the answer