Which of the Following Statements Explains Why Trading Partners

Which of the following statements explains why trading partners
Are often concerned about each other's labor standards?
I.From a humanitarian perspective, people do not want to buy
Products if workers are in oppressive conditions.
II.Unions realize that low standards for labor will be less costly,
And those products will compete more effectively with products
Produced at home.
III, Some nations do not enforce their own lax labor standards,
But have also signed on to trade agreements.

A) I
B) II
C) II and III
D) I, II, and III