In understanding and analyzing "demand," we focus on how much of a product the buyers are.

A. Willing and wanting to buyB. Actually buying now and in the recent pastC. Able to buy with their given incomeD. Willing and able to buy

D. Willing and able to buy

Explanation:

Demand actually refers to the amount of goods consumers are willing and able to buy considering their income.

Being willing is not enough a consideration in determining demand but the ability to back the desire to buy with a purchasing power is what determines demand.

Hence we focus on how much of a product the buyers are willing and able to buy in analyzing demand.

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