The short run is a time period that is too short to change the amount of any resource the firm employs.
This refers to the concept that states that at least one input is fixed while others are variable and also expresses the idea that an economy behaves differently depending on the length of time it has to react to certain stimuli.
Hence, as it means the time period during which at least one of the firm's inputs is fixed, it is also the time period that is too short to change the amount of any resource the firm employs.
In the concept, all the production process that takes place in the short run applies more of the variable factors (such as labour for example) to the fixed factor (capital, land)).
Therefore, the Option D is correct.
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