The national calendar of India is based on the Saka era, with as its firsi month and a normal year of 365 days was adopted from 22 March, 1957 along with the Gregorian calendar for official purposes.

Correct option is D

The Saka calendar, used as India’s national calendar, starts with the month of Chaitra.

Explanation:
● The Saka calendar was adopted on 22 March 1957 alongside the Gregorian calendar for official purposes.
● Chaitra corresponds to March-April in the Gregorian calendar.
● The Saka calendar is primarily used for traditional Hindu festivals and astronomical purposes.
● A normal Saka year consists of 365 days.

Information Booster:
● The Saka calendar begins in 78 CE, marking the reign of King Shalivahana.
● It harmonizes solar and lunar calculations, making it suitable for Indian traditions.
● Festivals like Ugadi and Gudi Padwa are celebrated in the month of Chaitra.

Additional Information:

• (A) Kartika: Eighth month in the Hindu calendar.
• (B) Ashadha: Fourth month in the Hindu calendar.
• (C) Pausha: Tenth month in the Hindu calenda