The answer is B. You're welcome.
Answer:
Bessemer had been trying to reduce the cost of steel-making for military ordnance, and developed his system for blowing air through molten pig iron to remove the impurities. ... This made steel easier, quicker and cheaper to manufacture, and revolutionized structural engineering.
Explanation:
The answer is D France exercised more direct control over its African colonies
Jean Henri Dunant in <span>1901 <span>Switzerland for discovering the Red Cross</span></span>