In recent years, many products that people use have released chemicals into the air. This has slightly changed the composition of the air that surrounds the planet.

TRUE

Explanation:

In the recent years, due to industrial revolution and industrialization, there are many products in the market which are harmful to the surrounding atmosphere or the product releases harmful toxic gases in the atmosphere.

For example, motor vehicles releases carbon dioxide as well as methane to the atmosphere which surrounds the air and it increases the temperature of the planet.

The flourine and the chlorine gases which are released from the refrigerators and the air conditioners mixes with air and depletes the ozone layer.

Also due to pollution, sulphur content is present in the surrounding air and it results in acid rain.

Thus it is true that many products which people uses in their daily life releases some chemical compounds in the air.

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the answer to your question is,

d. when a child was born.

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