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A number of sentences are given below which, when properly sequenced, from a coherent paragraph. Each sentence is labeled with a letter. Choose the most logical order of sentence from among the four given choices to construct a coherent paragraph.

A. All levels of demand, whether individual, aggregate, local, national, or international are subject to change.
B. At the same time, science and technology add new dimensions to products, their uses, and the methods used to market them.
C. Aggregate demand fluctuates with changes in the level of business activity, GNP, and national income.
D. The demands of individuals tend to vary with changing needs and rising income.