which one of the following statements is TRUE?

Question

Given (9 inches)^1/2 = (0.25 yards)^1/2, which one of the following statements is TRUE?                                                               

      (a) 3 inches = 0.5 yards                                                                  (b) 9 inches = 1.5 yards

      (c) 9 inches = 0.25 yards                                                                (d) 81 inches = 0.0625 yards