Step 1

The picture below shows the cylinder with the radius (R) of 2cm, and the height (H) of 7cm.

Step 2

Since R and H have the same unit, we can just calculate the volume of this cylinder as shown:

V = πR²H
               = (²²/₇)(2²)(7)
         = (22)(4)
= 88

Step 3

Now, the calculated number 88, is meaningless unless we include the unit for it. Since R and H units are in cm, the unit for volume will be cm³. Hence:

V = 88cm³

Step 4

Clearly, the answer is D.

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