Tree factories build the same widget. Th number of widgets produced in each factory are shown in the table. TABLE
(Hours) (Factory A) (Factory B) (Factory C)
1 8 9 6
3 24 18 18
6 42 27 36

Only one of the factories produces widgets at a constant rate.
Which equation represents y, the number of widgets produced in x hours, for the one factory that produces widgets at a constant rate?
A. y = 3x
B. y = 6x
C. y = 8x
D. y = 9x