Answer:
The correct answer is letter "A": Time value of money.
Step-by-step explanation:
The time value of money is a concept that states that a dollar today is always worth more than a dollar tomorrow. This concept is the main position of investors since having the money as of today represents that money could earn more interest if saved over some time. The more money than can be saved all at once the better. If added or subtracted at different times, the total interest earned could be lower.