The ratio of radii of earth to another planet is `2//3` and the ratio of their mean densities is `4//5`. If an astronaut can jump to a maximum height of `1.5 m` on the earth, with the same effort, the maximum height he can jump on the planet is
A. 1 m
B. 0.8 m
C. 0.5 m
D. 1.25 m
