'And consult them in the affairs ...'(Qur'ān 3:159). This expression emphasizes the importance of the principle of

A.

shūrā

B.

mu'āmalah

C.

Tatfīf

D.

bay'ah

Correct answer is A

Shura (Arabic: شُورَىٰ‎, shūrā) is an Arabic word for "consultation". The Quran and the Prophet Muhammad encourage Muslims to decide their affairs in consultation with those who will be affected by that decision.
It is by the Mercy from God that you (O Muhammad) were gentle with them, for if you had been stern of heart they would have dispersed from around you.
Holy Qur'ān 3:159