The extinct human ancestor, who ate only fruits and hunted with stone weapons was
(a) Ramapithecus
(b) Australopithecus
(c) Dryopithecus
(d) Homo erectus

Options

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

Answer

To solve the question regarding the extinct human ancestor who primarily ate fruits and hunted with stone weapons, we can analyze the options provided:

1. **Understanding the Options**:
- **(a) Ramapithecus**: This species is considered an early ancestor of humans but is not known for using stone tools or hunting.
- **(b) Australopithecus**: This genus is known for bipedal locomotion and is believed to have used simple stone tools for hunting and gathering. They primarily consumed fruits and lived in East African grasslands.
- **(c) Dryopithecus**: This genus is more closely related to modern apes and is not known for using stone tools or having a diet focused on fruits.
- **(d) Homo erectus**: This species is known for more advanced tool use and a varied diet, including meat, rather than being strictly fruit eaters.

2. **Identifying Key Characteristics**:
- The question specifies that the ancestor ate only fruits and hunted with stone weapons.
- Australopithecus fits this description as they are known to have lived around 2 million years ago in East Africa, used stone tools, and primarily consumed fruits.

3. **Conclusion**:
- Based on the characteristics and behaviors of these ancestors, the correct answer is **(b) Australopithecus**.

### Step-by-Step Solution:
1. Analyze each option to determine their diet and tool use.
2. Identify the characteristics of Australopithecus, including their habitat, diet, and tool usage.
3. Conclude that Australopithecus is the correct answer based on the evidence provided.