[单选题]
A 3.00-m long pipe is in a room where th mpr)5i.n hf;frd50 pdw:g5lhe tempj7xbz 2 n*3vleu51,vwu 0i;t8rj tfyqerature 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
