The correct answer is option 4, which states that statements 1, 2, 3, and 4 are all correct.

Let`s dissect each statement to understand them better:

1. In the stratosphere, temperature increases with altitude: This is true. The stratosphere is the second layer of the Earth`s atmosphere, located above the troposphere. In this region, temperature increases with altitude because of the presence of the ozone layer, which absorbs and scatters UV radiation from the sun, causing a temperature increase.

2. In the mesosphere, temperature decreases with altitude: This is true. The mesosphere is the third layer of the Earth`s atmosphere, located above the stratosphere. In this region, temperature decreases with altitude because the air molecules are much thinner, resulting in less absorption of solar radiation.

3. The lowest temperature of the atmosphere is recorded in the upper part of the mesosphere: This is true. The upper part of the mesosphere is known as the mesopause, where the temperature can reach as low as -90 degrees Celsius (-130 degrees Fahrenheit), making it the coldest region in the Earth`s atmosphere.

4. Tropopause is an isothermal zone: This is true. The tropopause is the boundary between