The correct answer is: C.Water's ability to stick to itself.
Cohesion refers to the attraction between water molecules themselves. This is why water droplets tend to stick together and why you see phenomena like surface tension, where water forms droplets or creates a "skin" on its surface.
Here's a breakdown of the other options:
A.The strength of the cohesion of all the water molecules combined: This describes surface tension, which is the result of cohesion at the surface of water, but this is not the definition of cohesion itself.
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