Final answer:
Suspended and colloidal matter with a negative charge will repel each other, keeping them dispersed and maintaining the stability of the colloidal system.
Step-by-step explanation:
When considering the electrical properties of colloidal particles, it is important to note that dispersed colloidal particles in one system typically have electrical charges of the same sign. Since like charges repel each other according to Coulomb's law, suspended and colloidal matter with a negative charge will repel each other. This is what keeps them dispersed and maintains the stability of the colloidal system.
Therefore, the correct answer to the question is:
- (A) They repel each other.