Final answer:
The correct answer is a) force of cohesion, force of adhesion. Cohesive forces are the attractive forces that exist between the same molecules, while adhesive forces refer to the attraction between different kinds of molecules.
Step-by-step explanation:
The force of attraction between the same kind of molecules is called cohesive forces, and between different kinds of molecules is called adhesive forces. Therefore, the correct answer to the question is a) force of cohesion, force of adhesion. Cohesion is responsible for phenomena such as surface tension, which causes the surface of a liquid to contract to the smallest possible surface area. On the other hand, adhesion causes different substances to cling together, like how water droplets stick to a window pane.