Gary saves $2.50 each day. Which equation describes the relationship between the number of days (d) Gary saves money and the total amount of money (m), in dollars, that he saves?

A. m equals 2.50d

B. m equals d minus 2.50

C. d equals 2.50m

D. d equals 2.50 divided by m

PLEASE HELP I DONT UNDERSTAND IT AT ALL