Which notice (A-H) says this (21-25)?

B1: Which notice (A-H) says this (21-25) ?
A: No entrance to art room
Use other door
B: Turn off all mobiles
During lessons
C: Found
Student's bag
See Mrs Wade in office
D: Class 4B
No history class today
Teacher !!!
E: Year 6 trip to Science Museum
Bus leaves Saturday 8:30 am
F: Do not leave bags
In front of this door
G: No running in school hall
H: Study Centre
Please return all books
to correct shalf

21 You should put things back in the right place
22 Go here if you have lost something
23 You must walk in this place
24 These students do not have a lesson
25 You cannotgo in through here