All other things unchanged, which of the following events leads to a shift further outward in the country's production possibility curve?
Select one:
a. Its labor force participation rate decreases by 5% per year compared to 3% per year.
b. Its saving rate falls from 8% to 1% per year.
c. Government expenditures on basic research increases by 10% per year.
d. The number of students completing college education falls.