[单选题]
Consider two pipes of the same length: one i x 0o9..cu 8g*eejycdzs open and the ay(;i659fza)sx haj b other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fund;i5 (fhybx ) aazas69jamental frequency of the closed pipe?
A. $150 \; Hz$
B. $300 \; Hz$
C. $450 \; Hz$
D. $600 \; Hz$