**Core Concept**
The synaptic transmission in autonomic ganglia primarily involves the release of neurotransmitters from the terminal ends of preganglionic neurons, which then bind to receptors on the postganglionic neurons, facilitating the transmission of signals.

**Why the Correct Answer is Right**
The correct answer involves the use of acetylcholine (ACh) as the primary neurotransmitter released from the preganglionic terminals. ACh binds to nicotinic receptors on the postganglionic neurons, leading to the depolarization of these neurons and the propagation of the signal. This process is crucial for the transmission of autonomic signals from the central nervous system to the effector organs.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the primary neurotransmitter involved in synaptic transmission in autonomic ganglia.
**Option B:** This option is incorrect because it refers to the neurotransmitter involved in the transmission of signals at the neuromuscular junction, not in autonomic ganglia.
**Option C:** This option is incorrect because it is not the primary neurotransmitter involved in synaptic transmission in autonomic ganglia.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the use of acetylcholine as a neurotransmitter in autonomic ganglia is a key aspect of the autonomic nervous system's function, and understanding this mechanism is crucial for diagnosing and managing disorders affecting autonomic function.

**Correct Answer:** C. Acetylcholine