The functions of money are... A. credit cards, checking accounts, currency, and coins.
B. medium of exchange, the ability to buy goods and services, and checking accounts.
C. medium of exchange, the ability to buy goods and services, and the ability to pay off debts.
D. medium of exchange, unit of account, and store of value.

d. medium of exchange, unit of account, and store of value

Explanation:

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)