explanatory variables as income in their forecasting models. Why are they different from Heinz?

We need theory$-$based methods to forecast revenues for companies such as FedEx and Sony because

A$.$ their revenue does not change substantially over time.

B$.$ demand for their products follows a trend line.

C$.$ structural factors affecting their demand change smoothly over time,

D$.$ demand for their products is affected by variables other than results from prior time periods.

E$.$ their revenue is not affected by underlying causal factors.