Consider the following scenario.

The firm you're working at (a large financial services firm) is considering instituting a costly change to its performance management system. Informally, there seems to be considerable disagreement among senior managers whether a new system would be valuable. To be more systematic, the HR team recommends surveying a small sample (e.g., about n = 15) of senior leaders because they are busy and HR does not want to bother them.

Which of the following aspects did the HR team overlook when making its recommendation about sample size?

A. Variability in the underlying variable (i.e., disagreement about new system's value)

B. Cost of investing in a new performance management system.

C. Time it takes for senior managers to take a survey

D. Both A and B were overlooked.

Not sure if I answered correctly for this question. Steps would be great.