Concept:The sentence parts must be arranged so that the subject, action, and context form a logical and grammatically correct sequence.
Explanation:Start with the subject and main action:
Q ("India has participated actively in multilateral forums").
Then specify the topics:
R ("relating to disarmament, non‑proliferation and").
Next, add the broader scope and condition:
P ("international security, taking into account its national security interests and priorities").
Finally, place the locational phrase:
S ("in the international security arena").
The full sentence reads: "India has participated actively in multilateral forums relating to disarmament, non‑proliferation and international security, taking into account its national security interests and priorities in the international security arena."
This order is coherent and grammatically correct.
Answer:Option D (QRPS)