So that their name can always be followed as an idol because of their great contribution
D) Treaties do not need approval and executive.
At least that's what I believe accordingly to reliable sources.
Sharia law is a form of a legal system in Islamic countries that is derived from the Koran and fatwas which are the texts of Islamic scholars. Sharia law acts as a code for living and behavior within the society that all Muslims should follow and it includes daily prayers, fasting, marriage, child education, chairity and so on.
It aims to help the Muslims understand how they should lead their everyday lives according to Allah.