What Is a Major Argument Against the GATT Treaty

What is a major argument against the GATT Treaty?

A) The United States will have to compete against countries with unlimited pools of exploited labor.
B) The United States will lose millions of jobs involving low-end employment and these types of workers are least capable of finding other employment.
C) Both a and b above are major arguments against GATT.
D) Neither a nor b above is a major argument against GATT.