Which of the Following Is False

Which of the following is false?

A) The benefits of additional calls to a broker in a month increase as more calls are made.
B) Calls should be made to a broker as long as the benefits are greater than the costs.
C) The average daily holding of funds is the amount of each withdrawal divided by two.
D) The benefit of an additional call to the broker is the additional interest that is earned on the larger amount of funds held in bonds during the month because of the call.