Concept:Hadith 15 of an-Nawawi teaches the signs of true faith and lists the social duties a believer must perform.
Explanation:The hadith instructs every believer to speak good or keep silent.
It also commands that a believer honour his neighbour.
It further commands that a believer honour his guest.
Thus, options A, C, and D correctly reflect the teachings of Hadith 15.
But the hadith does not mention consciousness of Allah in all places.
Being conscious of Allah everywhere, known as taqwa, is the subject of another hadith from the same collection, not Hadith 15.
Answer:Option B. consciousness of Allah in all places.