What connects to the connecting rod on the opposite end of the crankshaft?

The correct answer is the piston, as the connecting rod serves as the link between the piston and the crankshaft. This connection is essential for the operation of an internal combustion engine, as the movement of the piston up and down in the cylinder translates into rotational movement of the crankshaft.

As the piston moves downward due to the combustion process, the connecting rod pushes on the crankshaft, causing it to rotate. This rotation not only drives the vehicle's wheels but also powers various engine components through the crankshaft.

Each component mentioned in the other choices serves a different purpose in the engine. The camshaft is responsible for opening and closing the engine's intake and exhaust valves, while the flywheel helps to smooth out the power delivery from the crankshaft and maintains inertia. The crankshaft pulley is involved in driving accessory components, such as the alternator and power steering pump, but does not connect directly to the connecting rod. Thus, the direct relationship between the connecting rod and piston highlights why the piston is the correct answer.