The definition of dyspeptic is a person with poor digestion, something that relates to poor digestion or a depressed person.
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:
<em>Mercedes </em>drives like no other car.
Rhythm is a patterned repetition of a motif, formal element, etc., at a regular or irregular intervals in the same or modified form.