[单选题]
A 3.00-m long pipe is in a room whew oof,*ynrgj)wx af3n7kac *d+8ye; 9 re th.vfa 9labk ,l7g/ha :ie temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?
A. $57 \; Hz$
B. $114 \; Hz$
C. $29 \; Hz$
D. none of the above