Correct Answer - Option 1 : Thursday
11 August 2018 is a Saturday so 11 August 2017 was a Friday (2018 is not a leap year).
21 April 2017 to 11 August 2017 = 10 + 31 + 30 + 31 + 11 = 113 days i.e. 16 weeks + 1 odd day
20 April 2017 + 113 days or 1 odd day = 11 August 2017
So, Friday - 1 day = Thursday
Hence, the correct answer is 'Thursday'.
