S1 문장의 [______]에 들어갈 단어는?

난이도 고난도 · 힌트를 덜 열수록 높은 점수 (현재 5점)
Prosocial behavior ─ that is, behavior that is [______] to help another person ─ can be motivated by two different pathways, according to Daniel Batson at the University of Kansas.