You have to decide which of the following items are stocks and
which are flows: 1) your knowledge about driving, 2) the number
of car accidents you had last year, 3) your shoes, 4) the
level of your income. Choose the best option below.
1. Items 1) and 3) are stocks.
2. Items 1) and 4) are stocks.
3. Items 1), 3), and 4) are stocks.
4. All of the items are stocks.