The following figure shows the section ABC of an equilateral triangular prism. A ray of light enters the prism along LM and emerges along QD. If the refractive index of the material of the prism is 1.6, angle LMN is

A

$$35.6^\circ$$

B

$$37.4^\circ$$

C

$$39.4^\circ$$

D

$$41.3^\circ$$