A. 15 people lost their job when the minimum wage was increased from $12 to $18.
Explanation:
According to the graph, 33 people were working when the wage was $12. Later the wage was increased to $18. So the equilibrium was shifted to left. The working number of people was reduced to 18. Now on taking the difference,
33-18= 15
15 people lost their job, when the minimum wage was increased from $12 to $18.
The correct option is A. 15