Answer: Option (a) is the correct answer.
Step-by-step explanation:
It is true that like charges repel each other because their line of force repel each other.
For example, when two positively charged ions are placed together then they tend to repel each other.
Whereas unlike charges attract each other.
For example, when we place a negative charge near a positive charge then the positive charge will readily get attracted to the negative charge because the line of force also attract each other.