Which event marks the beginning of Islamic Hijri calendar?

This question tests knowledge of a pivotal event in Islamic history that marks the commencement of the Islamic Hijri calendar. Understanding this foundational event is crucial for comprehending Islamic chronology and its historical significance.

• Correct Option B: The Islamic Hijri calendar begins with the Holy Prophet Muhammad (SAW)'s migration (Hijrat) from Makkah to Madina in 622 CE. This momentous event, known as the Hijra, established the first Muslim community-state in Madina, marking a new era for Islam and signifying a turning point in its history and the development of the Muslim Ummah.
• Option A: The conquest of Makkah occurred much later (8 AH) and is not the calendar's starting point.
• Option C: The birth of the Holy Prophet (SAW) predates the Hijra by many decades.
• Option D: The Treaty of Hudaibiya was signed in 6 AH, after the calendar's inception.