Demand is the willingness and ability to
A. buy a given good or service.
B. offer a given good or service.
C. increase the price of a given good or service.
D. decrease the price of a given good or service.

The answer is A.

Explanation:

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Carbon dioxide and Oxygen are the two gases of air which dissolves in water by diffusion The oxygen is dissolved in water so that fishes can take in oxygen through water to breathe, this is the biological importance of this process in nature. ... Fizzy drinks contain carbon dioxide dissolved in water.