In the idiom "in good feather"， we change "good" into "high， full" without changing meaning. This change of constituent is known as（） . [ ]

In the idiom "in good feather"， we change "good" into "high， full" without changing meaning. This change of constituent is known as（） . [ ]
A、addition
B、replacement
C、position-shifting
D、variation
正确答案：B