How is shape D diffrent from shapes A, B,C

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?