Pick from:
A). gas and steam
B). spark and steam
C). diesel and internal combustion
D). external and internal combustion engines

Answer the following question given this paragraph: A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. Two basic types of combustion engines are external and internal combustion engines. Q: What are the two basic types of combustion engines? A:
Answer:
D).