Concept:Zakat is the Islamic practice of giving wealth to support the poor and needy.Explanation:In Islam, Zakat is an obligatory form of charity for those who are wealthy. It purifies wealth and helps meet the needs of the poor and needy in society.The other options are not primarily about wealth distribution:• Hajj is pilgrimage to Makkah.• Salat is ritual prayer.• Sawn is fasting during Ramadan.Therefore, the correct practice is Zakat.Answer:D. Zakat