Correct Answer - Option 1 : Wednesday
5th day of the month = Friday - 4 = Monday
Now, to find the day on 21st of the same month, we will need to find the number of odd days between 5th and 21st of the month.
Odd days = 21 - 5 = 16 = 2 odd days
Now, odd days in 16 days are 2.
Monday + 2 odd days = Wednesday.
Therefore, the day on 21st of the given month is Wednesday.