[单选题]
In a resonating pipe which h 8h0.gabqgx sz+h 3d-eo0r5dgd9a e. mi0c ghjjz9auar8j/ p; 0xf2*is open at both ends, there
A. are displacement nodes at each end.
B. are displacement antinodes at each end.
C. is a displacement node at one end and a displacement antinode at the other end.
D. none of the above
