The correct answer is:
**The Thirty was an oligarchy, the ecclesia was a democracy, and the Mycenaean Palace was a monarchy.**
**Explanation:**
- The **ecclesia** refers to the assembly in ancient Athens where citizens could vote on important issues, making it a hallmark of **democracy**.
- The **Thirty** refers to the Thirty Tyrants, a group of oligarchs who took control of Athens after the Peloponnesian War, making this an **oligarchy**.
- The **Mycenaean Palace** system was characterized by a centralized authority led by a king (wanax), indicating a **monarchy**.
Thus, the statement accurately reflects the governmental structures described in the chart.