......is used for making parachutes and ropes for rock climbing.

Options

A. Nylon
B. Rayon
C. Polyester
D. None of these

Answer

To answer the question "......is used for making parachutes and ropes for rock climbing," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question is asking about a material that is specifically used for making parachutes and ropes for rock climbing.

2. **Consider Common Materials**: Think about the types of materials that are typically used in these applications. Parachutes and climbing ropes require materials that are strong, durable, and lightweight.

3. **Evaluate Synthetic Fibers**: Among synthetic fibers, nylon is well-known for its strength and durability. It is commonly used in various applications, including parachutes and climbing ropes.

4. **Eliminate Other Options**:
- **Rayon**: Known as artificial silk, it is not strong enough for these applications.
- **Polyester**: While it is used in clothing, it is not the primary material for parachutes or climbing ropes.

5. **Conclude the Answer**: Based on the evaluation, the correct answer is **nylon**.

### Final Answer:
Nylon is used for making parachutes and ropes for rock climbing.

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