Question

Read the text below and answer the question that follows.

Answer 1

The answer to your question would be that the element that is necessary to complete the sentence above is the following one: Subject. That is, the correct option would be D.

A sentence is a group of words giving a complete thought. What is more, a sentence must contain a subject and a verb. In this case, the sentence does have a verbal predicate but no subject. Therefore, this sentence is grammatically incorrect.

Answer 2

D) Subject is the element necessary to complete the sentence above.
You already have a predicate (drives), so you don't need that, or a subordinate/independent clause. What you do need is a subject. For example:
Mercedes drives like no other car.