Correct Answer:
B. Hazrat Umar (R.A.)
Correct answer: Hazrat Umar (R.A.). Yarmuk (636 AD) was fought against the Byzantines in the era of Hazrat Umar (R.A.).
- Hazrat Abu Bakr (R.A.) is not the correct answer to this question.
- Hazrat Usman (R.A.) is not the correct answer to this question.
- Hazrat Ali (R.A.) is not the correct answer to this question.