$12)$ A spherical particle specific density is $7\mathrm{.}5,$ water density is

$998$ kg$/$m$^3,$ fluid viscosity is $0\mathrm{.}0105$ Pa s$,$ diameter of the sphere is $0\mathrm{.}25$ mm$,$

$$K criteria is

A $0)1\mathrm{.}2$; B $0)6\mathrm{.}6$; C $0)2\mathrm{.}08$; C O$)$ none