Suppose That the Professional Association of Dentists Reduces Entry into Their

Suppose that the professional association of dentists reduces entry into their profession by lengthening the required training program.The likely effect is that

A) the supply curve of dentists will shift to the left.
B) the supply curve of dentists will shift to the right.
C) both the demand and supply curves for dentists will shift to the left.
D) the demand curve for dentists will shift to the right.
E) there will be an increase in the quantity of dentists supplied.