Answer: The cohesive forces between the water molecules will decrease.
Step-by-step explanation:
Cohesive forces are defined as the molecular forces which are present between same substances.
Cohesive forces between the water molecules means the forces which are present between water molecules.
Thus, if the temperature of the system increases, water particles move apart because they gain kinetic energy. The forces binding water molecules together will weaken up and so, the cohesive forces between the water molecules will decrease.