Answer:
March 4
Explanation:
The fifth Thursday must happen 4 weeks after the first one. That means that the 5th Thursday is 28 days after the first one.
Feb 1 + 28 days = Feb 29
Feb 1, Thursday
Feb 8, Thursday
Feb 15, Thursday
Feb 22, Thursday
Feb 29, Thursday
Mar 1, Friday
Mar 2, Saturday
Mar 3, Sunday
Mar 4, Monday
Answer: March 4