What describes the action of the turbocharger?

The action of the turbocharger primarily increases airflow into the engine, which enhances the engine's efficiency and power output. It does this by using the energy from the exhaust gases produced during combustion. As these gases exit the engine, they spin a turbine connected to a compressor. The compressor draws in ambient air, compresses it, and forces a denser air charge into the engine's intake. This increase in airflow allows for more fuel to be burned, leading to a more powerful combustion process.

While some options may seem plausible, the primary function of a turbocharger focuses on enhancing the engine's performance by increasing airflow, enabling the engine to generate greater power and efficiency.