Explanation:

Correct option 2: saturday

To find the day of the week on 29th September 2019, given that 29th September 2015 was a Tuesday, we will calculate the number of days between the two dates and determine the weekday shift.

Step 1: List years between 2015 and 2019

We are comparing:

• 29 September 2015 (Tuesday)
• 29 September 2019 (What day?)

Years in between:
2016, 2017, 2018, 2019

Step 2: Count leap years and normal years

• 2016 is a leap year → adds 2 days
• 2017 → normal year → adds 1 day
• 2018 → normal year → adds 1 day
• 2019 → we are checking 29th September, so we go from 29 Sep 2015 to 29 Sep 2019 — exactly 4 years.

So total extra days:

= 2 (2016) + 1 (2017) + 1 (2018) = 4 days

Step 3: Add 4 days to Tuesday

• Tuesday + 4 days = Saturday