Correct Answer - Option 3 : Saturday
Given, 3rd Day of the month = Friday
So, 7 × 3 = 21
21 + 3 = 24 so, 24th day will be also Friday.
Therefore, 4th day after twenty first = 21 + 4 = 25 since, 24 is Friday , 25th will be Saturday.
Hence, option 3 is the correct answer.