Answer :
Chinese use steel and iron in order B. to make chains for suspension bridges. iron and steel is used to reinforce bridges in order to become strong adn firm whenever heavy loads such as vehicles and people come by on the bridge. Great wall is made up of stones and bricks
The correct answers are, B) to make chains for suspension bridges, and D) to make agricultural tools.
The Chinese used steel and iron to make chains for suspension bridges and to make agricultural tools.
Since the middle age, China has used the iron to make agricultural tools and later, chains for suspenssion bridges. Although in early years most of the steel was used for war purposes, the Steel and iron industry in China has developed considerably quickly due to the market reform and the autonomy of the industry, that began in 1970, as well as new technologies to produce steel.