Riba Is a Fundamental Doctrine of Islamic Finance

Riba is a fundamental doctrine of Islamic finance.Riba is:

A) Usury,whereby the borrower pays back more than the amount borrowed to take into account the time value of the money.
B) Ambiguity,in relation to outcomes of transactions,for example gambling.
C) A forbidden practice,for example investing in gambling or businesses producing alcohol.
D) Profit and loss sharing,whereby both parties share the profits and the risks.