Which factor is primarily responsible for location a having a lowet average yearly temperature than locstiom b?

This is due to changes in atmospheric chemistry. This is as a result of both natural and human activities such as industrial emission of gases in one location than the other or even the quantity of greenhouse gases emitted in the atmosphere. This may cause differences in average yearly temperature for different locations. Also, natural changes in the sun which affect the amount of incoming solar radiation may also be responsible for these differences.