$10.$Thomas Edison turns on a light bulb that emits light uniformly in all directions. His assistant, Bob, stands $2$ m away from the bulb, and measures the intensity to be $0\mathrm{.}75\frac{W}{m^2}.$ Another assistant, Mike, stands $6$ m from the bulb. What is the intensity of the light where Mike stands?

$(2)0\mathrm{.}083\frac{W}{m^2}$

B $0\mathrm{.}433\frac{W}{m^2}$

C $0\mathrm{.}021\frac{W}{m^2}$

D $0\mathrm{.}250\frac{W}{m^2}$

E $0\mathrm{.}750\frac{W}{m^2}$