Surface tension is caused by a force of ??.at the free surface.

Adhesion

Cohesion

Both (A) and (B)

Either (A) or (B)

Surface tension is caused by a force of cohesion at the free surface.
The cohesive forces between molecules in a liquid are shared with all neighboring molecules.
Those on the surface have no neighboring molecules above and, thus, exhibit stronger attractive forces upon their nearest neighbors on and below the surface.

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