The value of the line integral ∮F . rds , where C is a circle of radius units is ________Here, F ( x, y ) = y + 2xĵ and r is the UNIT tangent vector on the curve C at an arc length s from a reference point on the curve and are the basis vectors in the x y Cartesian reference. In evaluating the line integral, the curve has to be traversed in the counterclockwise direction.

• A. 18
• B. 13
• C. 16
• D. 15