**Core Concept**
Non-depolarizing neuromuscular blockers are a class of medications used to relax muscles by competing with acetylcholine for receptor sites at the neuromuscular junction. However, some non-depolarizing agents have additional effects due to their ability to act on nicotinic receptors at the autonomic ganglia, leading to ganglionic blockade.

**Why the Correct Answer is Right**
The correct answer is a non-depolarizing neuromuscular blocker that has significant ganglionic blocking activity. This is due to its ability to bind to nicotinic receptors on the ganglionic neurons, preventing the release of neurotransmitters and leading to a decrease in sympathetic and parasympathetic outflow. This results in a decrease in blood pressure, heart rate, and vasodilation.

**Why Each Wrong Option is Incorrect**
* **Option A:** This agent is primarily used for its depolarizing effects and does not have significant ganglionic blocking activity.
* **Option B:** While this agent can cause some ganglionic blockade, it is not as potent as the correct answer and is primarily used for its neuromuscular blocking effects.
* **Option D:** This agent is a depolarizing neuromuscular blocker and does not have significant ganglionic blocking activity.

**Clinical Pearl / High-Yield Fact**
When using non-depolarizing neuromuscular blockers, it is essential to be aware of their potential for ganglionic blockade, particularly in patients with autonomic dysfunction or those receiving other medications that may exacerbate this effect.

**Correct Answer:** C.