Explanation:

Let’s break it down:

- Option 1: Double Descent

- This isn’t about organizing kin into four equal parts. It means inheritance is traced through both mother and father, but in different domains—like property from the dad, ritual from the mom. Not “four sections.”

- Option 2: Dual organisation

- Sounds like two sections, right? Sometimes called “moieties,” these systems split a society in half. But occasionally, when those halves are each split again, you get four sections. That’s your “four section system.”

- Option 3: Bilinear

- That’s just tracing descent through both sides, sort of a catch-all for mom’s side and dad’s side together. No special four-section structure.

- Option 4: Bilateral

- Similar to bilinear—inheritance or membership from both sides equally. It’s about inclusion, not organization into four parts.

So here’s the answer:

Option 2: Dual organisation