Answer:
C. transportation routes
Step-by-step explanation:
Hoyt’s model was proposed in 1939 and it states that cities grow in sectors and they radiate along travel routes. Also, it considerates that a sector will remain the same because of the function it has and land will be used for the same.
This model gives a big importance to transportation routes which affect the arrengement of the city. Because of this, the answer is that factories and upper-class residential areas radiate from the center of the city along transportation routes.