Answer:
The correct option is a
Step-by-step explanation:
A bubble solution is made from a mixture of soap and water. A bubble is an "air bag" trapped and wrapped in a shiny soap film. The shiny soap film is made up of soap and water. The soap is on either sides of a thin water layer. Hence, the answer to the question is water.
Although, water are not actual biomolecules but could act as one since they are involved in various biological processes at the molecular level.