The correct answer would be D.
In all of the options you provided, driving would be the gerund.
S
''The doctor determined the cause of Gina's health problem.'' is a simple sentence.
A simple sentence consists of only one clause having only one subject, the predicate. It may or may not contain an object.
In the given sentence, there is a subject 'the doctor,' a predicate "cause" and an object "cause of Gina's health problem."
On the other hand, compound sentence consists of more than two independent clauses.
An independent clause has a proper meaning and it makes sense without the other clause.
These independent clauses are joined together using a conjunction such as: yet, nor, for, so, and, but & many more.
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“The use of animal fat violated Hindu and Muslim beliefs and cause the native soldiers to revolt. This revolt led to one of the largest massacres of British men and women ever recorded.”-
“An attempt was made to evict these Mahajarins, whereupon the military police were attacked by a crowd of some forty Maharanis and the British officer who intervened was seriously wounded with a spade.”-
“A detachment of Indian troops at Kacha Garhi thereupon fired two or three shots at the Mahajarin for making murderous assault on the British officer. One Mahajarin was killed and one wounded and three arrested.