If C is a curve and -C is the same curve which is traversed in the opposite direction, then,
∫−CF.dr=−∫CF.dr\int_{-C} F.dr =- \int_C F.dr∫−CF.dr=−∫CF.dr
because reversing the direction of the curve from C to. -C changes the sign where F is the vector field.
The correct answer is OptionD.
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