A. 1 A.H.
B. 3 A.H.
C. 2 A.H.
D. 4 A.H.
Zakat was made obligatory in 2 A.H.
Zakat is a form of alms-giving treated in Islam as a religious obligation or tax, which, by Quranic ranking, is next after prayer in importance. As one of the Five Pillars of Islam, zakat is a religious duty for all Muslims who meet the necessary criteria of wealth. Wikipedia