In the Equation for the Net Present Value of Migration,,the

In the equation for the net present value of migration,,the term "E₂" refers to: $$V _ { p } = \sum _ { n = 1 } ^ { N } \frac { E _ { 2 } - E _ { 1 } } { ( 1 + i ) ^ { n } } - \sum _ { n = 1 } ^ { N } \frac { C } { ( 1 + i ) ^ { n } } - Z$$

A) the net psychic costs of moving
B) the length of time expected on the new job
C) earnings from the new job
D) earnings from the old job