Which parts of the computer system are designed to monitor the activities of the engine?

The correct choice is associated with sensors because they are specifically designed to monitor various activities and conditions within the engine. Sensors play a critical role in the vehicle's operation by measuring parameters such as temperature, pressure, and other vital metrics that reflect the engine's performance. For instance, they can detect the temperature of the coolant, the pressure of the fuel, and the oxygen levels in the exhaust.

This data is then relayed to the vehicle's computer system, which uses it to make adjustments that optimize performance, ensure safety, and enhance fuel efficiency. Sensors are essential for maintaining the engine's proper functioning and for diagnosing issues that may arise.