Question

farming fertilizers can ______.
release safe gases in the air
cause pollution if not done properly
reduce all pollution

Explanation:

• For the option "release safe gases in the air", fertilizers typically release gases like ammonia which are not safe in improper amounts, so this is incorrect.
• For "cause pollution if not done properly", improper use of fertilizers (e.g., over - application, wrong timing) can lead to water pollution (eutrophication), air pollution (ammonia emissions), and soil degradation, so this is correct.
• For "reduce all pollution", fertilizers are used to enhance crop growth and do not have a role in reducing all types of pollution; in fact, improper use causes pollution, so this is incorrect.

Answer:

B. cause pollution if not done properly