The correct answer is:
- **C. Ionic**
Explanation:
1. The Ionic order in Greek architecture is characterized by an entablature with a three-panel architrave.
2. The architrave consists of three horizontal bands with the middle band often being more decorative or embellished.
3. Additionally, the Ionic order typically features a decorated frieze, which is the middle part of the entablature above the architrave.
4. This combination of a three-panel architrave and a decorated frieze is a distinguishing feature of the Ionic order.
Therefore, the Greek order that has an entablature with a three-panel architrave and a decorated frieze is the Ionic order.