When nafta went into effect in 1994, what was the concern of labor leaders and environmentalists in the united states?

a) they believed mexico would increase their prices to the us to make up for the difference.

b) the feared that mexican companies would drive out of business established corporations in the united states.

c) they feared the us would lose money by not imposing tariffs, therefore, leading to an increase in unemployment.

d) they believed companies would move to mexico where wages were lower and environmental controls were less, therefore, leading an increase in the us unemployment rate and more pollution.