One of the choices below does not belong, in the doctrine :

"Five Pillars of Islam.

a
Recognizing Allah as the one, true God and Muhammad as God's messenger
b
Daily prayer
c
Alms-giving to the needy
d
Fasting during the month of Ramadan (ninth month of the Islamic calendar)
e
Pilgrimage to the Sacred House of Allah in Mecca
f
Give a contributional offering to the covenant