Which of the following statemets is correct ?

Options

A. Newton belonged to U.K., who discovered law of gravitation.
B. Einstein belonged to England, who discovered laws of photoelectric effect.
C. John Bardeen belonged to France, who discovered transistors
D. W.K. Roentgen belonged to Holland, who discovered X-rays.

Explanation

To determine which of the statements is correct, we will analyze each statement one by one.

### Step 1: Analyze Statement A
- **Statement A**: "Newton belonged to UK, who discovered law of gravitation."
- Isaac Newton was indeed from the UK (specifically England) and is credited with the discovery of the law of gravitation.
- **Conclusion**: Statement A is correct.

### Step 2: Analyze Statement B
- **Statement B**: "Einstein belonged to England, who discovered laws of photoelectric effect."
- Albert Einstein was not from England; he was born in Germany.
- While Einstein did contribute to the understanding of the photoelectric effect, he did not discover it alone; his work was pivotal, but the effect was known before his research.
- **Conclusion**: Statement B is incorrect.

### Step 3: Analyze Statement C
- **Statement C**: "John Bardeen belonged to France, who discovered transistors."
- John Bardeen was an American physicist, not from France. He is one of the co-inventors of the transistor.
- **Conclusion**: Statement C is incorrect.

### Step 4: Analyze Statement D
- **Statement D**: "W. K. Roentgen belonged to Holland who discovered X-rays."
- Wilhelm Conrad Roentgen was actually from Germany, not Holland (the Netherlands). He is credited with the discovery of X-rays.
- **Conclusion**: Statement D is incorrect.

### Final Conclusion
After analyzing all the statements:
- Statement A is correct.
- Statements B, C, and D are incorrect.

Thus, the correct answer is **Statement A**.

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