The following graph depicts demand. 
Refer to the figure above.At point D,demand is:
Definitions:
Fun Run
A noncompetitive and recreational running event, usually organized for participants of all ages and abilities, often to support charity or community causes.
Pulmonary Semilunar Valve
A heart valve located between the right ventricle and the pulmonary artery that prevents blood from flowing back into the heart.
Pulmonary Trunk
The major vessel that exits the right ventricle of the heart, carrying deoxygenated blood to the lungs for oxygenation.
Oxygenated Blood
Blood that has been oxygenated by the lungs and is being transported by the arteries to the tissues throughout the body.
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