Shown below are 4 figures that represent the heat flow in a heat engine. The thickness of the arrows represents the amount of heat flow. TH is the high-temperature reservoir, TC is the low-temperature reservoir, QH is heat to/from TH, QC is heat to/from TC, and W is work. Which figure best represents a real heat engine? 
Definitions:
Major Depressive Disorder
A mental health disorder characterized by persistent feelings of sadness, loss of interest in activities, and a range of physical and cognitive symptoms.
Elation
A feeling or state of great joy or pride; elevated spirits or happiness.
Mania
A mental state characterized by extremely elevated mood, energy, and unusual thought patterns, often seen in bipolar disorder.
Negative Mood
A general, enduring state of mind characterized by negative emotions such as sadness, anxiety, or irritability.
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