Final answer:
The correct answer is A) You should hire Susan.
Step-by-step explanation:
The most relevant factor to consider when choosing between Robert and Susan for the manager position in the struggling division is their classification as internal or external candidates. In this case, Susan should be hired because she has been classified as an internal candidate.
Internal candidates have the advantage of already being familiar with the company's procedures and culture, which can lead to a quicker and smoother transition into the managerial role.