Ratio of a sphere (1 Viewer)

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Plz help me on this problem:

THe diameter of a certain sphere is 2 times the diameter of a second sphere.

B what is the ratio of their areas?
C. What is the ratio of their volumes?

I try to put 1 and 2 as a diameter of the sphere then compare its areas and volumes but I'm not sure if the ratio is a 100% correct. Plz help me on this.
What did you get for spheres of diameter 1 and 2?

What do you get for spheres of diameter d and 2d?

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