## Core Concept
The question pertains to methods of sterilization or disinfection relevant to medical equipment like syringes and needles. Autoclaving, dry heat sterilization, and ethylene oxide sterilization are common methods used for sterilizing medical equipment.

## Why the Correct Answer is Right
The correct answer, **C. Autoclaving**, is a method that uses high-pressure steam to sterilize equipment. Autoclaving is highly effective for eliminating bacteria, viruses, and spores from heat-resistant materials, making it suitable for syringes and needles. This method works by using steam under pressure to achieve temperatures above 100°C, ensuring that all forms of microbial life are killed.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is blank and cannot be evaluated.
- **Option B:** This option is blank and cannot be evaluated.
- **Option D:** This option is blank and cannot be evaluated.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **autoclaving** is the most commonly used method for sterilizing heat-resistant medical instruments, including syringes and needles, because it is effective against a broad spectrum of microbes, including spores.

## Correct Answer Line
**Correct Answer: C. Autoclaving.**