Question

did you know that ddt which harms the environment and poses risks to human health has since been banned in many countries. did you know that ddt, which harms the environment and poses risks to human health, has since been banned in many countries. did you know that ddt which harms the environment and poses risks to human health has since been banned in many countries? did you know that ddt, which harms the environment and poses risks to human health, has since been banned in many countries?

Explanation:

The original statement is a declarative sentence. To make it a proper question, a question - mark should be added at the end. Also, the relative clause "which harms the environment and poses risks to human health" is non - essential and should be set off by commas.

Answer:

D. Did you know that DDT, which harms the environment and poses risks to human health, has since been banned in many countries?