The figure indicates the energy levels of a certain atom. When the system moves from 2E level to E, a photon of wavelength $\lambda$ is emitted. The wavelength of a photon produced in transition from level $\frac{4E}{3}$ to level E is 

 

 

• A

  $\frac{\lambda }{3}$

• B

  $\frac{3\lambda }{4}$

• C

  $\frac{4\lambda }{3}$

• D

  $3\lambda$