Answer:
(a) He drove the car.
An independent clause is a group of words that can stand alone as a sentence. It expresses a complete thought and contains a subject and a predicate.
Explanation:
The core claim of the question is to identify the independent clause.
(a) "He drove the car." - This is an independent clause as it can stand alone as a sentence.
(b) "When she helped the boy" - This is a dependent clause as it cannot stand alone as a sentence.
(c) "On the table" - This is a prepositional phrase and not a clause.
(d) "Moving the box" - This is a participle phrase and not a clause.