Which equation is NOT true? (Ratios)

A. 1 m / 100 cm = 3 m / 300 cm

B. 1000 g / 1 kg = 5,200 g / 5.2 kg

C. 1 L / 1000 mL = 1.5 L / 1500 mL

D. 10 cm / 1 mm = 20 cm/ 2 mm
(PLEASE PROVIDE AN EXPLANATION BECAUSE I DON’T UNDERSTAND)