The basic rule of the time value of money (assuming positive interest rates) is:

a. investments will always be worth more tomorrow than they are today.

b. its always wiser to save a dollar for tomorrow than to spend it today.

c. a dollar in hand today is worth more than a dollar promised at some time in the future.

d. All of the statements above express an aspect of the basic rule of time value of money.

e. None of the statements above represent the basic rule of the time value of money.