Demand curve is a ____________ representation of various quantities of a commodity that a consumer is ________ and ________ to buy at different prices of the same commodity, while holding other factors constant.

Which of the following options suits best in the above blanks?

Graphical, able, willing

Although option 4 also contains the same words but their order is wrong. The first blank will be filled by graphical, and second and third by able and willing.