Which of the following can be a disadvantage of U. S. "Big Steel" as pointed out in the text

A．must guard against foreigners selling their steel at shocking prices.
B．had difficulty in sustaining development in face of foreign competitors.
C．can benefit enormously from the steel lower prices in world markets.
D．took advantage of the government's protection to enhance efficiency.

A．the downsizing in manufacturing industries.
B．the sharp increase in tech-sector production.
C．the incoming shipments of info-tech goods.
D．the increasingly wide trade gap in January.