The correct option is B Christmas day of 2019
Given, the fruit jam is packed on 26/09/2019 which is september 26th.
We know that September has 30 days. So, there are just 5 days left in september from the date of packing.
Then, in october there are 31 days, november has 30 days.
So, number of days starting from 26/09/2019 till november end is 4+31+30 = 65 days
But given that the fruit jam is best before 90 days from the date of packing. So we still need to add 90 - 65 = 25 days in December as well.
So, 90 days from september 26 is december 25.
∴ December 25 is the date of expiry for the jam which is also Christmas day of 2019.