As altitude increases in the atmosphere, the temperature generally decreases in the lower layers, such as the troposphere, which extends from the Earth's surface up to about 8 to 15 kilometers (5 to 9 miles) high. This decrease in temperature is generally due to the decreasing air pressure and density at higher altitudes.
However, in the higher layers of the atmosphere, such as the stratosphere, temperature trends can change. For example, in the stratosphere, the temperature can actually increase with altitude due to the absorption of ultraviolet radiation by the ozone layer.
So, the correct answer is that the temperature generally decreases with an increase in altitude in the troposphere, but it can fluctuate or increase with altitude in other layers of the atmosphere.