The correct option is B 78
Saka era was started by King Kanishka of Kushan empire. Kanishka was the greatest king of the Kushan dynasty that ruled over the northern part of the Indian subcontinent, Afghanistan, and possibly areas of Central Asia north of the Kashmir region. The Śaka era started in AD 78 is now used throughout India and is the most important of all. It has been used not only in many Indian inscriptions but also in ancient Sanskrit inscriptions in Indochina and Indonesia.