Question

the tightness across the surface of water caused by the polar molecules pulling each other allows this water strider to \walk on top\ of the water. the tightness is referred to as - capillary action surface tension universal solvent condensation

Explanation:

Surface tension is the property of the surface of a liquid that allows it to resist an external force, due to the cohesive forces between liquid molecules. In water, polar - water molecules have strong cohesive forces that create a 'tight' surface layer, enabling water striders to walk on it. Condensation is the change of water vapor to liquid. A universal solvent is a substance that can dissolve a wide variety of solutes. Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.

Answer:

C. surface tension