the year next to 1991 having the same calendar as that of 1990 is –
we go on counting the odd days from 1991 onward still the sum is divisible by 7 . the number of such days are 14 upto the year 2001 . so , the calender for 1991 will be repeated in the year 2002 . answer c
add(1991, subtract(1991, 1990))