In Industry X, All of Its Output Is Made in America

In industry X, all of its output is made in America. But then a foreign nation's workers can produce at least part of the industry X's good at a lower wage. The reduction in American jobs in industry X will be smaller when

A) American workers, while getting a wage twice that of foreigners, are 50% more productive.
B) the supply of labor supply is highly elastic.
C) the elasticity of supply of American workers is more inelastic.
D) American workers are excellent substitutes for foreign workers.