The Islamic calendar starts in the year that which significant event occurred?

The Islamic calendar, also known as the Hijri calendar, begins with the event of the Hijra, which marks the migration of the Prophet Muhammad and his followers from Mecca to Medina in 622 CE. This event is significant as it not only represents a pivotal moment in Islamic history but also the establishment of the Muslim community and the onset of an Islamic society.

Choice B references an event related to Muhammad's life, reflecting the tensions he faced in Mecca prior to the Hijra. However, it is important to note that the correct response focuses specifically on the migration itself, as it signifies the start of the Islamic calendar. The choices offered do not accurately pinpoint the Hijra, which is the defining event that marks the year 1 in the Islamic calendar.

The other options pertain to important moments or developments in Islamic history, but none correspond with the exact event that initiates the Islamic calendar. Each is relevant to the Islamic narrative yet does not fulfill the criteria for the starting point defined by the calendar itself.