The correct answer is option 'A', which states that sympathetic and parasympathetic nerves are types of the peripheral nervous system. Let's dive into the details to understand why this answer is correct.

The Peripheral Nervous System (PNS)
The peripheral nervous system is one of the two main divisions of the nervous system, with the other being the central nervous system (CNS). The PNS consists of nerves and ganglia (clusters of nerve cell bodies) located outside the brain and spinal cord. It connects the CNS to the rest of the body, allowing communication between the brain and various organs, muscles, and tissues.

Sympathetic and Parasympathetic Nervous Systems
The peripheral nervous system is further divided into the somatic nervous system and the autonomic nervous system (ANS). The ANS controls involuntary bodily functions such as heart rate, digestion, and respiratory rate. The ANS is then divided into two branches: the sympathetic nervous system and the parasympathetic nervous system.

Sympathetic Nervous System
The sympathetic nervous system is responsible for the body's "fight-or-flight" response. It prepares the body to deal with stressful or dangerous situations by increasing heart rate, dilating blood vessels, and releasing adrenaline, among other physiological changes. These responses help us react quickly and effectively to potential threats.

Parasympathetic Nervous System
On the other hand, the parasympathetic nervous system promotes the body's "rest-and-digest" response. It helps maintain normal bodily functions during periods of relaxation and non-stressful situations. The parasympathetic system slows heart rate, constricts blood vessels, and promotes digestion, among other functions.

Conclusion
In conclusion, sympathetic and parasympathetic nerves are part of the peripheral nervous system. The PNS connects the central nervous system to the rest of the body, and the sympathetic and parasympathetic nervous systems are two branches of the autonomic nervous system within the PNS. The sympathetic system prepares the body for action, while the parasympathetic system promotes relaxation and normal bodily functions.