Which of the following is the largest mosque in the world?

A. Imam Ali Mosque, Iraq
B. Great Mosque of Mecca, Saudi Arabia
C. Al-Masjid an-Nabawi , Saudi Arabia
D. Faisal Mosque, Pakistan

Explanation:

The Great Mosque of Mecca ‎‎, Masjid al-Ḥarām, lit. “the sacred mosque”), also called the Grand Mosque, , the Kaaba, in the city of Mecca, Saudi Arabia. Muslims face in the Qibla (direction of the Kaaba) while performing Salat (obligatory daily prayers).