Step 1: Understanding the relationship between the days.
If the seventh day of the month is three days earlier than Friday, then the seventh day is Tuesday (since Friday is the fourth day after Tuesday).
Step 2: Counting from the 7th day.
The seventh day is Tuesday.
The nineteenth day is 12 days after the seventh day. To find the day on the 19th, we calculate 12 days after Tuesday.
Counting 12 days from Tuesday:
Wednesday (1), Thursday (2), Friday (3), Saturday (4), Sunday (5), Monday (6), Tuesday (7), Wednesday (8), Thursday (9), Friday (10), Saturday (11), Sunday (12).
So, the nineteenth day is a Sunday.
Step 3: Conclusion.
The correct day is Sunday, so the correct answer is (1) Sunday.