Each of the Following,except One,would Lead to a Rightward Shift

Each of the following,except one,would lead to a rightward shift of the labor supply curve in a particular industry.Which is the exception?

A) increased preference for this type of work
B) increases in the demand for the good produced by labor
C) increases in the size of the population
D) reductions in the wage rates offered in alternative labor markets
E) reductions in the costs of acquiring human capital