JEE Main 2019 Physics question

A solid sphere, of radius R acquires a terminal velocity when falling (due to gravity) through a viscous fluid having a coefficient of viscosity η. The sphere is broken into 27 identical solid spheres. If each of these spheres acquires a terminal velocity, , when falling through the same fluid, the ratio () equals:

• (A)1/9
• (B)1/27
• (C)9Correct
• (D)27