Final answer:
Option (D) enables the proper drawing of the conclusion by establishing a direct link between Technocomp's permission for Ann to take a leave of absence and her decision, leading to her quitting only if they deny the leave.
Step-by-step explanation:
The conclusion that Ann will quit her job at Technocomp only if Technocomp finds out she has been offered the fellowship hin_ges on a conditional relationship between Technocomp allowing Ann to take a leave of absence and their knowledge of the fellowship offer. Among the provided options, (D) Ann will take a leave of absence if Technocomp allows her to take a leave of absence is the assumption that allows the conclusion to be properly drawn. This statement creates a direct link between Technocomp's allowance for leave and Ann's decision, meaning that if Technocomp does not allow the leave (because they find out about the fellowship), Ann will have no option but to quit her job.