What's wrong with the following frequency distribution?

What's wrong with the following frequency distribution?

                     X                  f

                220‑239            1

                200‑219            0

                160‑199            0

                140‑159          11

                120‑139          17

                100‑119          21

                 70‑ 99            14

                 60‑ 69              8

                 30‑ 59              7

                 20‑ 29              2

                  0‑ 19               1

                    total                   82

A.not exactly ten classes

B.unequal classes

C.gaps between classes

D.nothing is wrong