Concept:Fasting on the Day of Arafat is a highly recommended act for Muslims who are not performing Hajj.
Explanation:The Day of Arafat falls on the 9th day of Dhul-Hijjah.
For non-pilgrims, fasting on this day is a confirmed Sunnah.
This fast expiates the sins of the past year and the coming year.
Pilgrims are advised not to fast because it may cause undue hardship while standing at Arafah.
The Prophet Muhammad (peace be upon him) did not fast on that day while he was performing Hajj.
Thus, those who are not on pilgrimage are encouraged to fast in order to gain the great reward of this blessed day.
Answer:D. Arafat