One Model of Moving Assumes That a Family Will Move

One model of moving assumes that a family will move when the present value of the wage gains summed over the two spouses exceeds the full cost of moving.Which of the following observations (if true) would give the most support to this model?

A) The higher the observed wage gain of one spouse, the lower is the likely wage gain of the other spouse.
B) The higher the observed wage gain of one spouse, the higher is the likely wage gain of the other spouse.
C) The wage gain of one spouse is not related to the wage gain of the other spouse.
D) A married person and a single person are as equally likely to move when they have the same wage gain from moving.