The correct option is C involuntary
Actions which take place with consciousness or willingness of an individual are called the voluntary action. They can be easily controlled.
Example:- Breathing, running, walking, etc.
Actions which take place without consciousness or willingness of an individual are called involuntary action. They cannot be controlled.
Example:- Cellular respiiration, digestion, etc.
Reflexes are also involuntary actions. They usually involve a sudden movement in response to a stimulus.
Example:- Sudden jerky withdrawal of hand or leg when pricked by a pin.