Sierra Decided to Try Learning Ballet

Multiple Choice

Sierra decided to try learning ballet. However, after a few weeks she realized she was the worst in the class. Sierra signed up for extra lessons with the instructor. After the lessons, the instructor kept telling Sierra that she was slowly improving. Yet it was hard for Sierra to evaluate whether she was really improving as she could not see a noticeable difference. These ballet lessons are hard to evaluate due to

A) perishability.
B) client-based relationships.
C) intangibility.
D) heterogeneity.
E) inseparability.