Question

surface tension - creation of a \surface\ on top of water - is caused by:
hydrogen bonds forming between water molecules
water acting as a solvent
water striders
ionic bonds in water

Explanation:

Surface tension in water is due to hydrogen bonds. These bonds create cohesion among water molecules. Water acting as a solvent relates to its ability to dissolve substances, not surface tension. Water striders are insects that use surface tension but don't cause it. Water has polar covalent bonds, not ionic bonds.

Answer:

hydrogen bonds forming between water molecules