I want to know what the relationship between the Ato B , B to C , A to C?

70) Refer to the following graph. Capital B Btoc is the Scale Labor If the two isoquants represent profit maximizing levels of output for two different wage rates, the move from point A to point B represents the A) substitution effect of a reduction in the wage. B) output effect of a reduction in the wage. C) output effect of an increase in the wage. D) substitution effect of an increase in the wage