Which leadership function is most needed in the following situation?

Mariah and her sisters are picking their chores for the week.

Mariah: I did dishes last week, so I don't care who does 'em this week, but it's not gonna be me.

Clarissa: I'll do dishes as long as someone else does the trash and recycling.

Cassandra: What? No way! You haven't done the trash for like a month. You always stick us with it.

evaluation
making and keeping an agenda
conflict management
interaction