Question

water has surface tension because ...
water tends to evaporate from the surface.
molecules at the surface make more hydrogen bonds.
hydrogen bonds between surface water molecules resist being stretched.
cohesion forces are weaker at the surface.
there is positive pressure inside the water mass.

Explanation:

Surface tension in water is due to the hydrogen - bonds between surface water molecules. These hydrogen - bonds act like an elastic film and resist being stretched. Evaporation is not the cause of surface tension. Molecules at the surface make fewer hydrogen - bonds compared to those in the bulk. Cohesion forces are stronger at the surface, not weaker. Positive pressure inside the water mass is not related to surface tension.

Answer:

hydrogen bonds between surface water molecules resist being stretched.