**Core Concept**
Muscular violence, also known as tetany, refers to the involuntary, violent contraction of muscles, often resulting from an imbalance of electrolytes, particularly calcium.

**Why the Correct Answer is Right**
The classical example of muscular violence is tetany, which is characterized by the involuntary contraction of muscles, leading to symptoms such as muscle spasms, cramps, and stiffness. This condition is often caused by hypocalcemia, a deficiency of calcium in the blood, which affects the function of the nervous system and muscle contraction. The decreased calcium levels disrupt the normal functioning of the nervous system, leading to abnormal muscle contractions.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the classical example of muscular violence. While muscle cramps can be a symptom of various conditions, they are not the defining feature of muscular violence.
**Option B:** This option is incorrect because it is too vague and does not specifically describe the condition of muscular violence. Muscle weakness can be a symptom of many conditions, but it is not a classical example of muscular violence.
**Option C:** This option is incorrect because it describes a different condition altogether. Hypertension is a condition characterized by high blood pressure, which is not directly related to muscular violence.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that hypocalcemia can lead to tetany, and that this condition can be caused by various factors, including vitamin D deficiency, hyperparathyroidism, and certain medications.

**Correct Answer:** C. Hypocalcemia.