Region X belongs to the movement of electrons which is common in all 3 processes. Option C is correct.
When 2 surfaces slide against each other then it's called friction. The electrons are released from the objects during friction.
The charge or energy that is moved from one object to another when they are in touch is called Conduction.
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.
