Not All Similarly Skilled Workers Are Included in Unions

Not all similarly skilled workers are included in unions. As a result, wages for unionized workers tend to be higher than for nonunion workers. As a significant number of skilled workers seek work in the nonunion sector, what is the impact on the supply curve and wages for nonunion labour?

A) The supply curve shifts left, increasing wages for non-union workers.
B) The supply curve shifts right, reducing wages for non-union workers.
C) The supply curve shifts right, increasing wages for non-union workers.
D) The supply curve shifts left, reducing wages for non-union workers.