Only a part heat energy absorbed can be converted to work by heat engine because:

Heat engine dumps some heat as a waste into it's environment.

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As heat flows in, it brings along some entropy that increases with heat transfer.

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Statement given is false, heat can be converted into work completely.

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None of the above

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Solution

The correct options are
A Heat engine dumps some heat as a waste into it's environment.
C As heat flows in, it brings along some entropy that increases with heat transfer.
Only a part heat energy absorbed can be converted to work by heat engine because:
Heat engine dumps some heat as a waste into it's environment.
As heat flows in, it brings along some entropy that increases with heat transfer.

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