How Do Higher Savings Rates Contribute to Higher Worker Productivity

How do higher savings rates contribute to higher worker productivity in a country?

A) Savings reduces inflation, which helps keep wages down, which reduces prices, enhancing productivity.
B) Savings leads to investment in capital. Higher capital per worker increases productivity.
C) Savings leads to investment in land. More land per worker increases productivity.
D) Savings reduces costs to firms because they do not need to borrow. Lower costs mean higher productivity.