Chaitra 1 of the national calendar based on the Saka Era corresponds to which one of the following dates of the Gregorian calendar in a normal year of 365 days?
(a)
22 March (or 21st March)
(b)
15th May (or 16th May)
(c)
31st March (or 30th March)
(d)
21st April (or 20th April