Concept:Istislah is the Islamic legal principle of reaching a decision that serves the public interest, known as Maslaha, when the Qur'an and Sunnah offer no explicit ruling.
Explanation:When Muslim jurists confront a new matter, they first search for guidance in the Qur'an and the authentic Sunnah.
If no direct answer is found, they rely on recognised juristic principles to reach a ruling.
Urf means the established custom of a society, and it is not necessarily tied to public welfare.
Ijtihad is the general effort a scholar makes to deduce a legal ruling, but it does not specifically guarantee that the ruling benefits the whole community.
Jihad refers to striving in the cause of Allah and is not a principle for making juristic decisions.
Istislah, on the other hand, is the specific principle used when a decision is based solely on what is beneficial for the public.
A ruling made in this way is therefore described as Istislah.
Answer:C. Istislah