Here's a problem to solve: On February 21, a student observes that the Moon cannot be seen in the clear night sky. On what date will the student not be able to see the Moon again in the clear night sky?

Among the 4 following options, which is the correct answer?

- A: February 28
 
- B: March 7
 
- C: March 14
 
- D: March 21
 