Correct Answer - Option 3 : 4
According to given information, we have the possible arrangements as follows:
1). P is shorter than Q but taller than R
Q > P > R
2). S is shorter than P but taller than R
P > S > R
3). T is shorter than Q but taller than P.
4). U is taller than the Q and height of U and V are equal.
U = V > Q > T > P
After combining all the arrangements, we get:
U = V > Q > T > P > S > R
Here, there are total 4 boys that are taller than P, are U, V, Q and T.
Hence, "4" is the correct answer.