Use the following to answer questions:
Figure: Short-Run Costs 
-(Figure: Short-Run Costs) Look at the figure Short-Run Costs. A is the _____ cost curve.
Definitions:
Placebo Effect
A phenomenon where an individual experiences a perceived improvement in condition due to personal expectations, rather than the effect of an active medical treatment.
Subjective Well-Being
Someone's self-evaluation concerning their overall happiness and life fulfillment.
Epinephrine
A hormone also known as adrenaline, secreted in response to stress and increases heart rate, muscle strength, blood pressure, and sugar metabolism.
Lymphocyte Activity
The functions and behaviors of lymphocytes, a type of white blood cell, in the immune response to protect the body from foreign substances.
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