Which of the Following Best Describes the Impact of Iron

Which of the following best describes the impact of iron smelting on the natural world?

A) Because iron was easier to extract than other metals, people had to disrupt nature far less to obtain it.
B) Iron and bronze metallurgy differed little in how they affected the environment.
C) Iron smelting produced less pollution than bronze metallurgy.
D) Tools made from iron enabled people to clear woodlands far faster than with tools made from bronze.