Listen to a teacher making an announcement. 'Good morning, students. Please remember that the annual science fair is next Friday. All project submissions are due by the end of the day this Wednesday. Make sure your name and class period are clearly marked. Also, don't forget that on Thursday, we will have a special assembly in the auditorium with a guest speaker from the local university's science department. Attendance is mandatory.' What is the main purpose of this announcement?
-
A
To describe the guest speaker's background.
-
B
To remind students about important upcoming science-related events and deadlines.
-
C
To explain the rules for the science fair in detail.
-
D
To cancel the special assembly on Thursday.