Concept:Factor by grouping terms that have common factors, then use the distributive property.Explanation:The given expression is 6pq−3rs−3ps+6qr.Take the common factor 3 outside:=3(2pq−rs−ps+2qr)Group the terms as (2pq+2qr) and (−ps−rs):=3(2q(p+r)−s(p+r))Now take (p+r) as the common factor:=3(2q−s)(p+r)Answer:The correct factorization is 3(2q−s)(p+r), which is option C.