Why were americans in the 1990s concerned about outsourcing?

a. some americans worried that signing international trade agreements would increase outsourcing to the united states from foreign companies
b. some worried that reducing trade barriers would cause outsourcing to foreign countries, leading to job losses within the united states
c. some were worried that the quality of american-made products available in the united states for sale would decrease as a result.
d. some were worried that low-skilled immigrant workers would no longer have an incentive to move to the united states.