The frequencies of X-rays, $\mathrm{\gamma }\text{-rays }$ and ultraviolet rays are respectively a, b and c. Then

• A

  $\mathrm{a} < \mathrm{b}, \mathrm{b} > \mathrm{c}$

• B

  $\mathrm{a} > \mathrm{b}, \mathrm{b} > \mathrm{c}$

• C

  $\mathrm{a} > \mathrm{b} ,\mathrm{b} < \mathrm{c}$

• D

  $\mathrm{a} < \mathrm{b}, \mathrm{b} < \mathrm{c}$