Concept:The special weekly congregational prayer Muslims observe on Friday is called Salat al-Jumu'ah.Explanation:• Muslims gather every Friday for a congregational prayer that replaces the regular midday (Zuhr) prayer.• This Friday prayer is known as Jumu'ah.• The other options are not Friday congregational prayers: Eid is festival prayer, Janazah is funeral prayer, and Zuhr is the normal midday prayer.Answer:C. Jumu'ah