Step 1: Identifying the weekday of the 1st of the month.
Since 5th is a Tuesday, counting backward:
4th - Monday, 3rd - Sunday, 2nd - Saturday, 1st - Friday
Step 2: Finding the 3rd Friday.
- 1st Friday = 1st
- 2nd Friday = 8th
- 3rd Friday = 15th
Step 3: Adding 3 days to the 3rd Friday.
\[
15 + 3 = 18
\]
Thus, the correct answer is (D) 18.