Concept:Hadith 10 of an-Nawawi focuses on the purity of deeds and earnings.Explanation:The Prophet (peace be upon him) stated that Allah is Pure and accepts only what is pure.This means Allah does not accept charity or good deeds that come from unlawful or impure sources.The Hadith teaches that believers must earn and spend from lawful means.Only deeds performed with sincere intention and lawful provision are accepted by Allah.Thus, the lesson is that Allah accepts only that which is good and pure.Answer:Option C: Allah accepts only that which is good.