Correct option is D
P is taller than Q → This means P > Q.
R is taller than S → This means R > S.
S is taller than Q but shorter than P → This means P > S > Q.
P is shorter than R → This means R > P.
Combining all these relationships, we have:
R > P > S > Q.
Thus, R is the tallest.
The correct answer is (d) R.