The correct answer is: A. The Spinal Cord.
Reflex actions are involuntary actions that are controlled by the spinal cord. They are rapid, automatic responses to stimuli that do not require conscious thought. For example, when you touch a hot stove, your hand will jerk back without you having to think about it. This is because the spinal cord has a reflex arc that automatically sends a signal to the muscles in your hand to contract.
The spinal cord is a long, thin bundle of nerves that runs from the base of the brain down the back. It is responsible for controlling many of the body’s automatic functions, such as breathing, heart rate, and digestion. It also plays a role in movement, sensation, and reflexes.
The spinal cord is made up of millions of nerve cells. These cells are connected to each other by synapses. When a stimulus is received, it travels along a nerve cell to the spinal cord. The spinal cord then sends a signal to the muscles to contract or relax. This is how reflex actions are controlled.
The brain is also involved in some reflex actions. However, the spinal cord is the main control center for reflexes.