Basic economic theory predicts that a rise in the hourly minimum wage from $7.25 to $10 will

a)raise the incomes of all workers who were earning less than $10 per hour

b)raise the incomes of some workers who were earning less than $10 per hour and lower the incomes of some other workers who were earning less than $10 per hour.

c)neither raise nor lower the incomes of any workers who were earning less than $10 per hour

d)lower the incomes of all workers who were earning less than $10 per hour.