Compressor surge is caused by which of the following factors?

Correct Answer: Option A — Interrupted airflow.

Compressor surge is fundamentally caused by an interruption or mismatch in airflow relative to the engine's rotational speed. When the compressor cannot maintain the required pressure ratio, the air flow reverses, leading to the characteristic violent pressure fluctuations. This condition is often triggered by rapid throttle movements or inlet flow distortions.