Answer: B
Step-by-step explanation:
Let the radii of the smaller and larger spheres be x and y respectively. if their volumes are in a ratio of 64:125, it means that
x^3:y^3 = 64:125
x^3/y^3 = 64/125
Taking the cube root of both sides,
x/y = 4/5
Thus, the ratio is
4:5