[单选题]
A 3.00-m long pipe is in a room where tfdqr qqip811vjc52fbik0ljy/ t /a7) he temoqi h.(k4 (s*aahk yp2perature 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
