How many fundamentals (Arkaan) are there in Islam?

(A) 3
(B) 5
(C) 7
(D) 9

The answer is: (B) 5
The five pillars of Islam are: (1) the shahada (or kalma), (2) salat (or namaz), (3) zakat (charity to the poor), (4) Fasting (or saum) and (5) Hajj (pilgrimage to Makkah).