Choose the correct statements from the following:

Options

A. Steel is more elastic than rubber.
B. The stretching of a coil spring is determined by the Young's modulus of the wire of the spring.
C. The frequency of a tuning fork is determined by the shear modulus of the material of the fork.
D. When a material is subjected to a tensile (stretching) stress the restoring forces are caused by interatomic attraction.

Explanation

To solve the question regarding the correctness of the statements provided, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: "The stretching of the coil spring is determined by the Young's modulus of the wire of the spring."**
- **Analysis**: This statement is correct. The Young's modulus is a measure of the stiffness of a material and determines how much it will stretch or compress under a given load. In the case of a coil spring, the material's Young's modulus directly influences its ability to stretch when a force is applied.
- **Conclusion**: **Correct**

2. **Statement B: "The frequency of a turning clock is determined by the shear modulus of the material of the clock."**
- **Analysis**: This statement is incorrect. The frequency of a turning clock, particularly in mechanical clocks, is primarily determined by the properties of the spring (like its Young's modulus) and the design of the escapement mechanism, not the shear modulus. The shear modulus relates to how a material deforms under shear stress, which is not relevant to the frequency of a clock.
- **Conclusion**: **Incorrect**

3. **Statement C: "When a material is subjected to a tensile stress, the restoring force is caused by the interatomic attraction."**
- **Analysis**: This statement is also incorrect. The restoring force in a material under tensile stress is primarily due to the interatomic bonds and the material's Young's modulus. The restoring force is not simply due to interatomic attraction but rather the overall elastic properties of the material, which are described by Young's modulus.
- **Conclusion**: **Incorrect**

### Final Evaluation:
- **Statement A** is correct.
- **Statement B** is incorrect.
- **Statement C** is incorrect.

### Summary of Correct Statements:
- Only **Statement A** is correct.