Which of the Following Best Describes the Effect on the Aggregate

Multiple Choice

Which of the following best describes the effect on the aggregate supply curve if political negotiations result in a substantial decrease in the price of oil?

A) The AS curve does not shift but there is an upward movement along it.
B) The AS curve does not shift but there is a downward movement along it.
C) The AS curve shifts rightward.
D) The AS curve shifts leftward.
E) There is no change to the AS curve.