Q. Coefficient of contraction is the ratio of

• (A) Actual velocity of jet at vena contracta to the theoretical velocity
• (B) Loss of head in the orifice to the head of water available at the exit of the orifice
• (C) Loss of head in the orifice to the head of water available at the exit of the orifice
• (D) Area of jet at vena-contracta to the area of orifice