Which of the following are key components of the DTNA Base Engine?

The selection of the cylinder block and cylinder head as key components of the DTNA Base Engine is astute because these parts are fundamental to an engine's structure and function. The cylinder block serves as the main body of the engine, housing multiple critical components such as the cylinders, pistons, and crankshaft. Its design and material significantly influence the engine's durability and performance.

The cylinder head sits atop the cylinder block and contains vital components such as valves, spark plugs, and fuel injectors. This part is crucial for managing the intake and exhaust processes, ensuring that the engine operates efficiently and effectively. The interaction between the cylinder block and cylinder head is integral to the combustion process, which is central to engine operation.

While the other options mentioned include important elements related to vehicle operation, such as transmission, exhaust systems, fuel tanks, and electrical components, they do not represent the core components that are intrinsic to the functioning of the engine itself. The combustion process, which occurs within the cylinder block and involves the parts contained within the cylinder head, is fundamental to generating the power required for vehicle movement.