In Economic Terms,how Would You State What Has Happened When

Multiple Choice

In economic terms,how would you state what has happened when your neighbor says he is unwilling to help you mow your lawn because you are unwilling to help him teach his kids how to speak with a British accent?

A) A medium of exchange was unavailable.
B) Your neighbor's unwillingness to mow your lawn reflects a lack of ability to store value.
C) The double coincidence of wants was not satisfied.
D) Money types were not identical.
E) Your unwillingness to provide British-accent tutoring services reflects that too much paper money is available.