In which year, according to standard historical dating, was Hazrat Ali (RA), the fourth Caliph, assassinated?

Explanation

• Hazrat Ali (RA) was assassinated in 661 CE, which corresponds to 40 AH.
• The attack took place in Kufa, the city he had made the capital of the caliphate.
• His death closed the era of the Khulafa-e-Rashideen, the four rightly guided caliphs.
• Option A 656 CE is the year he became caliph, not the year he died.
• The Umayyad caliphate began soon afterwards under Muawiyah, and the capital moved to Damascus.