Alexander, P : was a disciple of Aristotle, Q : who was a great conqueror, R : whom the world acknowledge as the greatest philosopher S : the world has ever known The Proper sequence should be:

The correct answer is A. PQSR.

Alexander was a disciple of Aristotle, who was a great conqueror, whom the world acknowledges as the greatest philosopher the world has ever known.

In this sentence, P (Alexander) is the subject of the sentence, and Q (was a disciple of Aristotle) is the predicate. R (who was a great conqueror) is an appositive phrase that modifies Q. S (whom the world acknowledges as the greatest philosopher the world has ever known) is another appositive phrase that modifies Q.

The correct sequence of the sentence is therefore PQSR.