Final answer:
The best word to describe Susan Le Flèsche's quest in 'Homeward the Arrow’s Flight' is 'ultimate,' indicating her central ambition and commitment to serving her people through medicine.
Step-by-step explanation:
The question refers to Susan Le Flèsche and her efforts to serve her community through medicine, as described in "Homeward the Arrow’s Flight." Based on the context that Susan Le Flèsche's medical practice was part of her larger goal to serve her people, the word that best describes her quest is (C) ultimate. The quest being referred to is not simply a minor consideration or one of many; it appears to be her central, paramount ambition. Therefore, 'ultimate' aptly characterizes the magnitude and significance of her determination to improve the health and wellbeing of her own people. This dedication likely faced obstacles and challenges, but the term 'ultimate' conveys the utmost importance of her mission, reflecting a deep commitment rather than a turbulent, passive, irreducible, or abrasive journey.