A median voter model is defined as $\_\_\_.$

A$.$

None of the answer is correct.

B$.$

a model showing that there is a tendency for decision in a democracy to reflect the interests of a group of voters who own the majority of the economy's wealth.

C$.$

a practice of trading votes among members of a legislative body, which allows minority interests to prevail.

D$.$

a model showing that there is a tendency for decision in a democracy to reflect the interests of voters whose preferences lie near the middle of the scales.