In a heat engine, I. work done \( (W) \) by the system in a cycle is transferred to the environm...

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In a heat engine,
I. work done \( (W) \) by the system in a cycle is transferred to the environment via some arrangement, e.g. the working substance in a cylinder with a moving piston transfers mechanical energy to the wheels of a vehicle via a shaft.
II. working substance can be a mixture of fuel, vapour and air in gasoline.
Choose the incorrect statement (s).
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
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