Final answer:
A ganglion is a dense, interconnected mass of nerve cells located outside the central nervous system, typically found in the peripheral nervous system,the correct option is A).
Step-by-step explanation:
The interconnected mass of nerve cells located outside the central nervous system (CNS) is known as a ganglion. A ganglion is a cluster of neuron cell bodies in the peripheral nervous system (PNS). In the central nervous system, a similar structure is referred to as a nucleus.
In contrast, a bundle of axons in the peripheral nervous system is called a nerve. Ganglia can be found associated with the dorsal root of all spinal nerves and with many cranial nerves as well. Sensory ganglia contain unipolar sensory neurons, while autonomic ganglia are involved in the autonomic nervous system and can be found in locations such as the sympathetic chain and near the controlled organs.