Text stimulus (diagram): Directed network diagram titled 'Returned and Unreturned Support.' Four circles: Jordan at left, Riley at center, Sam at right, Taylor at bottom. Two-headed arrow between Jordan and Riley. Two-headed arrow between Riley and Sam. One-headed arrows from Jordan to Taylor, Riley to Taylor, and Sam to Taylor. No arrows originate from Taylor. Display details: arrowheads clearly and label every circle. Which member faces the highest risk of being seen as an unreliable exchange partner?