Concept:This question tests the central message of Hadith 5 of an-Nawawi, which is the rejection of any action or practice introduced into Islam that is not supported by the Qur'an or Sunnah.
Explanation:Hadith 5 quotes the Prophet Muhammad (SAW) saying: "He who innovates something in this matter of ours that is not of it will have it rejected."
This means any newly invented religious practice that contradicts Islamic teachings is unacceptable.
The hadith therefore teaches the rejection of fabrications and the condemnation of devilish innovations.
It also supports banning all illegal acts because they are not part of the true religion.
The hadith does not specifically discuss the abolition of usury, which is addressed elsewhere in Islamic teachings.
Answer:C. abolition of usury