Concept:Compare fractions by converting them to decimals or using cross multiplication.Explanation:Check each option one by one.Option A: 53​=0.6 and 75​≈0.714. So 0.6>0.714 is false.Option B: 52​=0.4 and 308​≈0.267. They are not equal.Option C: 51​=0.2 and 31​≈0.333. So 0.2<0.333 is true.Option D: 131​=1.333 and 261​≈2.167. So 1.333>2.167 is false.Only option C is correct.Answer:51​<31​