Region X belongs to the movement of electrons which is common in all 3 processes. Option C is correct.
Friction:
When 2 surfaces slide against each other then it's called friction. The electrons are released from the objects during friction.
Conduction:
The charge or energy that is moved from one object to another when they are in touch is called Conduction.
Induction:
It is the process by which charges are transferred from one object to another without coming in contact.
Since point 'X' represent all 3 phenomena,
Therefore, region X, belongs to the movement of electrons which is common in all 3 processes.