问题：[单选,材料题题]

[单选,材料题] What job will be done the day before the festival begins?

回答下面的题目
Student Volunteers Needed!
On Saturday, December 12th,from 10 A．M．until 4 P． M． , Carverton Middle School will be holding a music festival in the school gymnasium． The special event will feature a variety of
professional musicians and singers．

Task	Time	Date
Make posters	1 P．M．一4 P．M．	December 5th
Set up gym	11 A．M．一4 P．M．	December 1th
Help performers	9 A．M．一4 P．M．	December 12th
Welcome guests	10 A．M．一2 P．M．	December 12th
Clean up gym	4 P．M．一7 P．M．	December 12th

Interested students should speak with Ms．Braxton,the music teacher．Students who would like to help at the festival must have written permission from a parent or guardian．

What time will the festival begin?

A . Making posters．
B . Setting up the gym．
C . Cleaning up the gym．
D . Helping the performers．