P : took place Q : when militants opened fire on BSF men R : the encounter lasting over two hours S : in the town around 8.30 a.m. The Proper sequence should be:

The correct answer is: D. RPSQ

The encounter took place in the town around 8.30 a.m. It lasted over two hours. The militants opened fire on BSF men.

Option A: QPRS is incorrect because it puts the encounter before the militants opened fire on BSF men. This is not possible, as the encounter could not have taken place until after the militants opened fire.

Option B: QSRP is incorrect because it puts the encounter before the encounter lasted over two hours. This is not possible, as the encounter could not have lasted over two hours until it had taken place.

Option C: RPQS is incorrect because it puts the militants opening fire on BSF men before the encounter took place. This is not possible, as the militants could not have opened fire on BSF men until the encounter had taken place.

Option D: RPSQ is the correct answer because it puts the encounter first, followed by the militants opening fire on BSF men, and then the encounter lasting over two hours. This is the only sequence that is consistent with the information given in the question.