The correct answer is option 3: 2-3-1-4.

To understand the correct arrangement of the layers of the atmosphere, let`s dissect each option:

Option 1: 1-2-3-4

This option suggests that the mesosphere (1) is the innermost layer of the atmosphere, followed by the troposphere (2), stratosphere (3), and thermosphere (4). However, this is incorrect.

Option 2: 2-1-3-4

This option suggests that the troposphere (2) is the innermost layer, followed by the mesosphere (1), stratosphere (3), and thermosphere (4). However, this is also incorrect.

Option 3: 2-3-1-4 (Correct Answer)

According to this option, the correct arrangement is the troposphere (2) as the innermost layer, followed by the stratosphere (3), mesosphere (1), and thermosphere (4). This arrangement is accurate, making option 3 the correct answer.

Option 4: 3-4-2-1

This option suggests that the stratosphere (3) is the innermost layer, followed by the thermosphere (