Refer to figure.
Gas Turbine Engines – Axial-Flow Compressors
The axial-flow compressor has two main elements: a rotor and a stator (therefore, Figure 3 can be ruled out). The principle of the compressor stage is to convert kinetic energy into pressure (potential) energy.

A stage consists of one row of rotor blades, fastened to discs on a rotor drum, followed by a row of stator blades, which are fastened to the compressor outer casing. On both the rotor and the stator the spaces between the blades form divergent passages.

Going through the options:

• Figure 2 is incorrect, the incoming airflow would be pushed backwards by this rotor, as its orientation is not correct for its direction.
• Figure 3 has the rotor AFTER the stator which is incorrect.
• Figure 4 does not make sense as the airflow will not be redirected by the stator at all, in fact the stator would likely choke the down-going airflow and greatly reduce the effectiveness of the compressor
• We are left with Figure 1, which is correct.

Video Explanation: