Answer: A steam engine is an external combustion engine (ECE) in which the fuel is combusted outside of the engine, unlike an internal combustion engine (ICE) in which fuel is combusted inside the engine. ECEs have a lower thermal efficiency, but carbon monoxide production is more readily regulated.
Answer: C. clean with soap and water
Explanation: all the rest are unsanitary
Answer:
B. you still need the motivation to do it