Consider the Graph of the Labor Market Shown Here

Consider the graph of the labor market shown here. A wage rate of $25 could be an example of:
(i) an efficiency wage.
(ii) a minimum wage.
(iii) a wage rate negotiated by a labor union.
(iv) hysteresis.

A) (ii) and (iii) only
B) (iv) only
C) (i) , (ii) , (iii) , and (iv)
D) (i) , (ii) , and (iii)