Pick out the complete sentences from the options.

The correct answer is: Both b and c

A complete sentence is a sentence that has a subject, a verb, and an object conveying a complete thought. Option a is incorrect because it is not a complete sentence. Both options b and c are complete and meaningful sentences and thus the correct answer is option d. In option B, we have subject, verb and object. Whereas in option C, we have a independent clause and dependent clause.