To solve the problem of determining which day is three days before the day after tomorrow, given that today is Sunday, we can follow these logical steps:
- Understand the given information: Today is Sunday.
- Determine "the day after tomorrow":
- Tomorrow would be Monday.
- The day after tomorrow would therefore be Tuesday.
- Now, calculate "three days before" Tuesday:
- One day before Tuesday is Monday.
- Two days before Tuesday is Sunday.
- Three days before Tuesday is Saturday.
Hence, the day which is three days before the day after tomorrow is Saturday.
This aligns with the correct answer among the given options.