**Core Concept**
The condensation of dental amalgam is a critical step in achieving a strong and durable restoration. The force applied during condensation must be carefully controlled to prevent damage to the surrounding tooth structure while ensuring proper adaptation of the amalgam to the cavity walls.

**Why the Correct Answer is Right**
The recommended force for condensation of dental amalgam is 3-4 ounces (approximately 85-113 grams). This force allows for adequate removal of excess amalgam and ensures proper seating of the restoration without causing damage to the tooth. The force is typically applied through a condenser, which is used to compress the amalgam and remove excess material.

*Option A: 1-2 ounces* is too light, resulting in inadequate condensation and potentially leading to a restoration that is not fully seated.
*Option B: 5-6 ounces* is too heavy, causing damage to the surrounding tooth structure and potentially leading to post-operative sensitivity.

**Clinical Pearl / High-Yield Fact**
The "3-4 ounces rule" is a widely accepted standard for condensing dental amalgam, and it is essential to maintain this range to ensure a successful restoration.

**Correct Answer: C. 3-4 ounces.**