European currencies taken out of circulation and replaced with the Euro in

Which of the following is not an example of a resource?

a. an office building b. a product's price c. the land plowed by a farmer in order to grow corn d. the chief executive officer of a large corporation

A nation's capital stock was valued at $300 billion at the start of the year and $350 billion at the end. Consumption of private fixed capital in the year was $25 billion. Assuming stable prices, gross investment was:

A.  $25 billion B.  $50 billion C.  $75 billion D.  $90 billion