In case of materials the key factor may be.

The correct answer is: D. shortage of power

A shortage of power can lead to a shortage of materials, as factories may not be able to operate at full capacity. This can lead to a decrease in the supply of goods and services, which can in turn lead to an increase in prices.

Insufficient advertising may lead to a decrease in demand for a product, but it is not likely to lead to a shortage of materials. Restrictions imposed by quota may also lead to a decrease in demand, but they are not likely to lead to a shortage of materials. Low market demand may lead to a decrease in the production

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