Which of the following statements describes movement along a supply curve?
a) The market price of a good decreases, leading suppliers to lower their quantity supplied.
b) Suppliers decrease their quantity supplied at every price level because of a factor cost increasing.
c) Suppliers increase their quantity supplied at every price level because of a factor cost decreasing.
d) Consumers increase their quantity demanded in response to a price decrease.

e) A government tax increases, causing suppliers to charge more for every quantity of output.