A particle is being acted upon by four forces of `30 N` due east , `20 N` due north , `50 N` due west and `40 N` due south. The resultant force will be
A. `20sqrt(2)N, 60^(@)` South to West
B. `20sqrt(2)N, 45^(@)`, South of West
C. `20sqrt(2)N, 45^(@)`, South of East
D. `20sqrt(2), 45^(@)`, South of East