Hello there! So, the 5 hours will represent a whole number. There are 60 minutes in an hour, and as you may know, 15 minutes is one quarter of an hour, and one quarter is equivalent to 0.25 in decimal form. When we add, 5 + 0.25 is 5.25. There. María should write the time as 5.25 on her time card. The answer is C: 5.25.