(D) The angle of contact is defined as the angle between the tangent to the liquid surface at the point of contact and the solid surface inside the li

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(D) The angle of contact is defined as the angle between the tangent to the liquid surface at the point of contact and the solid surface inside the liquid.For a plane liquid surface,the tangent to the liquid surface at the point of contact is parallel to the wall of the container.Therefore,the angle between the tangent and the wall is $0^\circ$.