If 15th January 1996 is Monday, then what will be the day of the week on 30th March 1997?

Correct option is B

15th January 1996 was a Monday
The number of odd days from 15th January 1996 to 30th March 1997
1996 (Leap year)15th January 1996 - 31 December 1996 366 days - 15 days = 351 days = 351 ÷ 7 = 1 odd day
1997 (ordinary year)1st January 1997 - 30th March 1997 31 days + 28 days + 30 days = 89 days 89 ÷ 7 = 5
Total odd days 6
The number of odd days from 15th January 1996 to 30th March 1997 = 6
So, Six odd day get added to Monday because day asked in future.
Sunday was the day of the week on the 30th March 1997.