Daisy's friend calls her and asks her to meet at the park in exactly 40 minutes. Which method should Daisy use to most accurately determine when 40 minutes have passed?
A.
Daisy should count the minutes in her head after she receives the call.
B.
Daisy should look at a clock that shows hours and minutes only.
C.
Daisy should use an hourglass and flip it over every time the sand runs out.
D.
Daisy should use a stopwatch with minutes and seconds.