下面3个关系中，x和y成反比例关系的是请选择ABC8y-v1X-R(t4I2\)m/x-M5G1]7F5m1m4k:c6p;j'D0Q
A．（x+1）y=41]7F5m1m4k:c6p;j'D0Q
B．x/3 =4/y1]7F5m1m4k:c6p;j'D0Q
C． 3x =4y1]7F5m1m4k:c6p;j'D0Q