Well, to find the circumference of a circle, we can use the formula C=2r. So just plug in 3.5 into the formula. C=23.5. Multiply and we get C=21.99. which is about 22 So our answer would be C. 22 feet. Hope I helped!
That would be D. The first two would be fight (I think) except they don't include turning the calculator on. C is just plain wrong. D has all the right keystrokes.