2006 AMC 8 Problem 7

Circle X has a radius of \pi. Circle Y has a circumference of 8 \pi. Circle Z has an area of 9 \pi. List the circles in order from smallest to largest radius.

\textbf{(A)}\ X, Y, Z\qquad\textbf{(B)}\ Z, X, Y\qquad\textbf{(C)}\ Y, X, Z\qquad\textbf{(D)}\ Z, Y, X\qquad\textbf{(E)}\ X, Z, Y

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.