Heat and work are equivalent. This means:

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When we supply heat to a body, we do work on it

When we do work on a body, we supply heat to it

The temperature of a body can be increased by doing work on it

A body kept at rest may be set into motion along a line by supplying heat to it

answer is C.

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Detailed Solution

Concept: If we're interested in how heat is transformed into work, the conservation of energy principle comes into play. The conservation of energy concept is used in systems where heat transfer and completing work are the techniques for transporting energy into and out of the framework by the main law of thermodynamics. The change in internal energy of a framework rises to the net heat transfer into the framework less the net work done by the framework, according to the fundamental law of thermodynamics. The main law of thermodynamics is U=Q - W in equation form.
The change in internal energy U of the framework is represented by U. Q is the sum of all heat transfer within and outside the frame, i.e., Q is the net heat transferred to the frame. W denotes the framework's network, or the sum of all work done on or by the framework. We use the following sign conventions: if Q is positive, then there is net heat transmission into the framework; if W is positive, then there is net work done by the framework. As a result, positive Q gives energy to the framework whereas positive W depletes it. U=Q - W is something along those lines.
Hence, the correct option is 3.

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