问题详情

As the generations progress, feather length will increase because females do not prefer a specific length tail, but a longer-than-average tall. Eventually tail length will increase to the point______the liability survival is matched by the sexual attractiveness of the trait and an equilibrium will be established.
A．that
B．where
C．which
D．/请帮忙给出正确答案和分析，谢谢！