a. Coal and lumber.
b. Aluminum and iron.
c. Tin and magnesium.
d. Oil and steel.
Answer:- d. Oil and steel.
The correct answer is ‘oil and steel.’ During World War II, the United States produced more steel and oil than any other nation. This was caused by the nation’s abundant natural resources and its strong industrial base. These resources allowed the United States to build the weapons required to win the war.
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