The main difference between the internal combustion engine and the diesel engine is that the diesel engine

A. does not have a crankshaft.
B. does not utilize pistons.
C. has no connecting rods.
D. has no ignition system.

pretty sure its d

right

You are correct. The main difference between an internal combustion engine and a diesel engine is that a diesel engine does not have an ignition system, which is option D.

To verify this answer, we can examine the differences between internal combustion engines and diesel engines.

An internal combustion engine (ICE) is a type of engine that works by burning a mixture of air and fuel inside a combustion chamber. This combustion produces power, which is then transmitted to the crankshaft through pistons and connecting rods. The ignition system is responsible for igniting the air-fuel mixture in the combustion chamber, typically using a spark plug. This ignition process is essential to start the combustion process in an internal combustion engine.

On the other hand, a diesel engine is also an internal combustion engine, but it operates differently. A diesel engine uses compression ignition, which means it relies solely on the high-temperature and pressure generated by compressing the air inside the combustion chamber to ignite the diesel fuel. Because of this compression ignition process, a diesel engine does not require an ignition system with spark plugs.

Therefore, since a diesel engine does not have an ignition system, the correct answer is option D.