Refer to the figure showing the esophagus and stomach. 
The food bolus (green) is pushed down the esophagus because
A) longitudinal muscles are contracting at point 1 and relaxing at point 2.
B) longitudinal muscles are relaxing at point 1 and contracting at point 2.
C) circular muscles are contracting at point 1 and relaxing at point 2.
D) circular muscles are relaxing at point 1 and contracting at point 2.
E) circular muscles are relaxing at point 1 and longitudinal muscles are contracting at point 2.
Correct Answer:
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