In order to satisfy an increased demand for a good or service, more often appear in the market. a. taxes b. producers c. restrictions d. consumers

D consumers because one that buy it and rate things

A. taxes

Explanation:

As its a generally known fact that as the demand for any product increases the price for the same product also rises in the market. It's a universal agreement.  Thus as demand increases the price also increases and so does the quality of the stuff. In contrast, as the supply increases the price decreases and so does the quality but only quantity increases. This phenomenon can be explained as the current hike in oil and gas prices. The government lays taxes and other restrictions to raise the bar of demands as to get maximum profit from the consumers.