[单选题]
Consider two pipes of the samezcr.6avx :yt0 l/rg78mv r7uadength: one is open and the other is closed on one end. If the fundamental fraur8d mr/ 7v7gequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pipe?
A. $150 \; Hz$
B. $300 \; Hz$
C. $450 \; Hz$
D. $600 \; Hz$