[单选题]
A closed organ pipe of lqv5y50 +bd (zhdun7g2wzqo5 bengthp1wvzco d2k9qd +gn5k. (9mfx 0.75 m is played when the speed of sound in air is 340 m/s. What is thz. cfmg9wk oxd1pkd2 5v+nq9(e fundamental frequency?
A. $57 \; Hz$
B. $113 \; Hz$
C. $170 \; Hz$
D. $227 \; Hz$
