If k is coefficient of air resistance, A is frontal area projected by the vehicle in square metres and V is vehicle speed(in km/h) then the expession for air resistance A.R on the vehicle is _________

• A. A.R = k*A*V^2
• B. A.R = k*A*V^3
• C. A.R = 2k*A*V
• D. A.R = k*A*V