When a Union Bargains Successfully with Employers, What Happens to Quantity

Multiple Choice

When a union bargains successfully with employers, what happens to quantity of labour supplied and demanded in that industry?

A) Both the quantity of labour supplied and the quantity of labour demanded increase.
B) Both the quantity of labour supplied and the quantity of labour demanded decrease.
C) The quantity of labour supplied increases and the quantity of labour demanded decreases.
D) The quantity of labour supplied decreases the quantity of labour demanded increases.