Concept:Jihad means striving in the way of Allah, and the highest form is the inner struggle against one's own evil inclinations.
Explanation:The Prophet (S.A.W.) described the struggle against the soul and its selfish desires as the greatest Jihad.
This involves controlling anger, lust, and wrong intentions, and disciplining oneself to obey Allah.
The Prophet (S.A.W.) called the outward battle the lesser Jihad and the struggle against the self the greater Jihad.
Therefore, suppressing one's selfish desires is greater than Hajj, writing books, or waging war.
Answer:A. Suppressing one's selfish desires