Concept:Ratio quantities can be treated as multiples of a common constant, so substitute the given ratio numbers directly.Explanation:Since M:N:Q=5:4:3, let M=5, N=4, and Q=3.Substitute these values into the expression M2N−Q.So, M2N−Q=52(4)−3.Simplify the numerator: 2(4)−3=8−3=5.Therefore, the expression becomes 55=1.Answer:1Option C is correct.