[单选题]
A 3.00-m long pipe is in a room 6 62*aa,5w zl.g j1:hqemx-iwypyfglwhere the temptxsl+ 4o xz(*zr1h5rh) aff*s erature 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
