Which of the following factors used in a dimensional analysis calculation have a finite number of significant figures (in other words, they are not exact numbers) that might limit the precision of the calculated value?
A. A conversion factor for time of (60 min/1 hour)
B. A conversion factor for distance of (1000 m/1 km)
C. A measurement of speed equaling (27.7 km/hour)
D. None of the above