**Core Concept**
The preservation of amputated digits is a critical aspect of emergency trauma care, involving the management of the severed limb to maintain viability and facilitate potential reattachment. The primary goal is to maintain tissue perfusion, prevent ischemic damage, and preserve the limb's integrity.

**Why the Correct Answer is Right**
The correct answer involves the use of a specialized solution to preserve the amputated digit. The solution, typically a mixture of anticoagulants and nutrients, is designed to maintain tissue oxygenation and prevent cellular damage. The most common solution used is lactated Ringer's solution, which helps to maintain ionic balance and prevent the accumulation of metabolic byproducts. The digit should be stored in a sealed container or plastic bag to prevent desiccation and maintain a humid environment.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a solution that maintains tissue viability. Without a specialized solution, the digit will likely undergo ischemic damage and become non-viable for reattachment.
**Option B:** This option is incorrect because it does not provide a solution that maintains tissue oxygenation. While antiseptic solutions may be used to prevent infection, they do not preserve tissue viability.
**Option C:** This option is incorrect because it does not specify a solution that maintains ionic balance. Without a balanced solution, the digit's cells will undergo osmotic damage and become non-viable.

**Clinical Pearl / High-Yield Fact**
In emergency trauma situations, amputated digits should be preserved in a sealed container filled with lactated Ringer's solution to maintain tissue viability and facilitate potential reattachment. This can significantly improve the chances of successful reattachment and restore function to the affected limb.

**Correct Answer:** C. Normal saline