A man standing x metres north of A tower finds the angle of elevation of as top to be 30° .He then starts walking towards the tower. After walking a distance of x/2 metres, he turns east and walks another x/2 metres. Then he turns south and walks another x/2 metres. The angle of elevation of the top of the tower from his new position is

A

15°

B

60°

C

$$\tan^{-1} \sqrt{\frac{2}{3}}$$

D

$$\tan^{-1} \frac{2}{\sqrt3}$$