When Olivia Learned That Just Twenty of Her Yoga Studio

When Olivia learned that just twenty of her yoga studio customers accounted for eighty percent of her annual revenue,she probably:

A) adjusted class schedules to meet the needs of those twenty customers.
B) surveyed those twenty customers to see what other types of yoga classes they were interested in.
C) offered a special session for just those twenty customers.
D) analyzed the geodemographics of those twenty customers to see how she could attract more people like them.
E) all of these.