Seventh Generation, a "green" marketing company, uses CDSTEP to analyze the environment $($a tool introduced in chapter $5).$ In this analysis, they find that their loyal customer base is generally high$-$income. Which part of CDSTEP would have revealed this to them?

Multiple Choice

The $"C"$ and $"S"$ in CDSTEP

The $"D"$ in CDSTEP

The $"T"$ in CDSTEP

The $"$EP$"$ in CDSTEP