About `71%` of total global carbon is found is

Options

A. oceans
B. forests
C. grasslands
D. agroecosystems.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where about 71% of the total global carbon is found. We need to identify the correct reservoir of carbon from the options provided: oceans, forests, grasslands, or agro-ecosystems.

2. **Identifying Carbon Reservoirs**: In nature, carbon is stored in three main reservoirs:
- Oceans
- Atmosphere
- Dead decaying organisms

3. **Analyzing the Carbon Distribution**:
- It is known that oceans hold a significant amount of carbon. Specifically, it is stated that oceans contain about 71% of the total global carbon.
- The atmosphere contains only about 1% of the total global carbon.
- Dead decaying organisms also contain carbon, but the percentage is not specified in the context of this question.

4. **Conclusion**: Since the question specifically asks about the 71% of total global carbon, and we have established that this amount is found in the oceans, we can conclude that the correct answer is:
- **Oceans**.

### Final Answer:
- The correct answer is **Oceans**.

---