Why did the united states ban the use of ddt?
it began mutating.
it became too costly to continue its use.
its risks outweighed the benefits.
it was no longer effective.

The correct answer is : Its risks outweighed the benefits.

The DDT is an colorless, tasteless chemical compound which was originally developed as an insecticide.

DDT was used during second world war to control malaria among the troops and the civilians.

Later, it was used as pesticide in agricultural and household practices. Due to its excessive use it entered into the food chain and its amount in the food crossed the permissible level.

So, it was banned by United States.

C

Explanation:

Because

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stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.