Washington’s tribes require members to serve on the council
follow tribal law
oversee departments

follow tribal law

Explanation:

The tribal law is a set of rules and regulations that is based on The Natives' Indian culture. Active Native Indian tribes in United States tend to require their members to follow this law.

Government stance on Tribal law tend to be depended on the states.

For Washington , the state allowed active tribes to run and operate Tribal Court. This court stand as an independent establishment from the state court. It's specifically aimed to determine conviction for tribes member.  People who offended the rules within the tribal law can be vetted and receive punishment in this court.

i think it would be c.

hope i'm correct

explanation:

the answer is typhoon