{{}} If a river flows from west to east with constant velocity of 1.0 m s -1 and a boat leaves south bank heading towards north with velocity of 2.40 m s -1 , then resultant velocity of boat is

• A. 2.6 m s-1
• B. 2.7 m s-1
• C. 2.8 m s-1
• D. 2.9 m s-1