Correct Answer: Option C

Explanation

6pq-3rs-3ps+6qr = 3 (2pq - rs - ps + 2qr)

= 3 ({2pq + 2qr} {-ps - rs})

= 3 (2q{ p + r} -s{p + r})

= 3 ({2q - s}{p + r})

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