The earth's atmosphere makes it unique because:

it can sustain human and plant life
other planets do not have an atmosphere
it controls the weather
a combination of these

Option (4)

Explanation:

The atmosphere referred to as the gaseous envelope of the earth. It is comprised of variable gases with definite proportions. This atmosphere helps the living organisms on earth by protecting them from the harmful incoming solar radiations. When the solar radiation is incident on earth, this atmosphere reflects some of the energy back into space, some energy is absorbed by the atmosphere and the rest of it are absorbed by the land surfaces.

Earth is the only planet in the solar system where life exists.

The atmosphere is also responsible for the occurrence of various types of weathers at different places on earth.

Thus, the most appropriate answer is option (4), that is the combination of all the provided options.