Final answer:
The component circled in yellow is the Coolant Hose, which is part of the cooling system in a car.
Step-by-step explanation:
The component in the picture that is circled in yellow is the Coolant Hose. A coolant hose is part of the cooling system in a car and is responsible for carrying the coolant (or antifreeze) from the radiator to the engine and back. It helps regulate the temperature of the engine and prevent overheating. In the picture, the yellow-circled component is most likely a coolant hose due to its location and function.