Payment of Mehr to wife is:__________?

A. Depends on the Demand by Wife
B. It is social affair
C. Obligatory 
D. Not Ordained by Allah

In Islam the mahr (dowry) is one of the rights of the wife, which is hers to take in total and is lawful for her, in contrast to the widespread practice in some countries, where the wife is given no dowry. Evidence that the wife must be given her dowry is found in many places, for example the aayah (interpretation of the meaning): “And give to the women (whom you marry) their mahr (obligatory bridal money given by the husband to his wife at the time of marriage) with a good heart…” [al-Nisaa’ 4:4]