Which one of the following is highly evolved

Options

A. Homo habilis
B. Homo erectus
C. Ramapithecus
D. Australopithecus

Explanation

### Step-by-Step Solution

1. **Identify the Organisms**: The question lists four organisms: Homo habilis, Homo erectus, Rama Pithecus, and Australopithecus.

2. **Understand the Evolutionary Context**: All these organisms are part of the evolutionary lineage leading to modern humans (Homo sapiens).

3. **Examine Each Organism**:
- **Rama Pithecus**: An early ancestor that walked on all fours, indicating a less evolved state.
- **Australopithecus**: Also primarily a quadrupedal organism, though it may have shown some bipedal traits.
- **Homo habilis**: Known for using tools and showing some bipedalism, but still retained some primitive traits.
- **Homo erectus**: The first species in the Homo genus known for walking upright consistently and using tools effectively.

4. **Determine the Most Evolved**: Among these, Homo erectus is the most evolved due to its upright walking, tool-making abilities, and more advanced social behaviors compared to the others.

5. **Conclusion**: Therefore, the highly evolved organism among the given options is **Homo erectus**.