Please see the screenshot.

8 m

Step-by-step explanation:

The equation of a circle with center (h, k) and radius, r, is:

(x - h)² + (y - k)² = r²

Looking at the given equation, we have

r² = 16

√(r²) = √16

r = 4

The radius of the circle is 4 m.

Diameter = 2r = 2(4 m) = 8 m

8 m

Ok, so i did what i could to find the answer. Here it is.

0 is a multiple of every number, so Ben is right.

0 also is a factor of every number, so Rob is right.

So your answer is C-Both Ben and Rob are correct.

Hope this helped!

-Seth