Step-by-step explanation:
Given

Hope it will help :)
An exponential function can be expressed as:
y=ab^x we have two points so we can solve
64/8=(ab^4)/(ab^1)
8=b^3
2=b, now we have:
y=a(2^x), using point (4,64)
64=a(2^4)
64=16a
4=a so
y=4(2^x)
I would think that it would be A.... I am an expert but, only in 8th, so I would double check.
A. Coefficient of Variation
I think it is 3 as a possible answer