A man can row a boat in still water with a velocity of `8 kmph`.Water is flowing in a river with a velocity of `4 kmph`. At what angle should he row the boat so as to reach the exact opposite point
A. `150^(@)` to flow of water.
B. `120^(@)` to flow of water.
C. `30^(@)` to flow of water.
D. `90^(@)` to flow of water.
