问题详情

Whatismostlikelytomotivatevolunteerstocontinuetheirwork？查看材料
A.Individualdifferencesinroleidentity.
B.PubliclyidentifiablevolunteerT-shirts.
C.Roleidentityasavolunteer.
D.Practicaladvicefromresearchers.
请帮忙给出正确答案和分析，谢谢！