Pollution is the will have the greatest effect on human health

troposphere
stratosphere
mesosphere
thermosphere

Troposphere

Explanation:

Troposphere is the lowest layer of the earth atmosphere. Most of the clouds are found in this layer. It can influence the weather condition in a region. It can be affected by the pollution due to the abundance of toxic poisonous gases in the atmosphere. This layer of atmosphere affects the human health. The toxic gases may cause respiratory diseases like asthma, bronchitus and others.

answer: wheres the options

explanation:

i think that c)gold was found there

but i am not sure