 Which description is the best representation of Yrtok's role in the story?
Lack of complete loyalty to the state was likely to result in a siege of treatment that left the subject suitably "re-personalized." The maintenance of a proper viewpoint was a necessity if the Planetary State were to survive the hostile plots of Earth and the latter's decadent colonies. Kolin found himself in a group with Jak Ammet, a third cook, and Eva Yrtok, powdered foods storekeeper. Since the crew would be eating packaged rations during repairs, Yrtok could be spared to command a scout detail. Yrtok, a dark, lean-faced girl, led the way with a quiet monosyllable. Yrtok and Ammet paused momentarily before descending. As he reached her, whatever Yrtok was examining came to life and scooted into the underbrush with a flash of greenish fur.
 Her fall leads Kolin to find Ashlew
 She figured out what was wrong with Ammet when he fell.  She was the reason they had a quality water supply.  She found the purple berries, an important source of food for the stranded crew.  Her fall leads Kolin to find Ashlew