Mechanical work is specially important in systems that contains :

gas-liquid

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liquid-liquid

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solid-solid

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amalgam

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Solution

The correct option is A gas-liquid
Mechanical work is important in systems that undergo appreciable change in volume.

Since solids are incompressible, hence mechanical work is insignificant in solids.

However, gases and liquids(to some extent) undergo appreciable change in volume and hence, mechanical work becomes important in case of gases and liquids.

Therefore, the option is A.

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