Nitin departs from his home and walks 45 m towards the east. He then turns left and walks 48 m. He turns left again and walks 27 m. He takes a final left turn and walks 55 m. How far is he from a pole which is exactly 7 m to the south of his home?
(Assume that all the turns are 90° turns only.)

A

28 m

B

16 m

C

31 m

D

18 m