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f`(x)=(f(x+h)-f(x))/h
lets replace h f with your function g(x):
g`(x)=((x+h)^2-x^2)/h
we want to find g`(3), so we can replace x with 3:
g`(3)=((3+h)-3^2)/h
in other terms g`(3)=((3+h)^2-9)/h , that is exactly what answer b is
acoustic wren