Which Following Change in the Coffee Market Would Shift the Supply

Multiple Choice

Which following change in the coffee market would shift the supply curve to the right?

A) A study finds that drinking coffee leads to higher grades.
B) The wage for employees in the coffee business decreases.
C) The income in the economy increases.
D) Firms expect the price of coffee to increase in the future.
E) Fifty Starbucks coffee shops close down.