Sap of which plant is considered as a good substitute for diesel oil

Options

A. Euphorbia sp
B. Copaifera longsdorfii
C. Calotropis procera
D. Manihot glaziovii

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the name of a plant whose sap can serve as a good substitute for diesel oil.

2. **Research the Plant**: The plant in question is known for producing sap that can be used as an alternative to diesel fuel.

3. **Identify the Correct Plant**: The correct answer is **Copalfera langsdorffii**. This is a Brazilian tree whose sap is recognized as a viable substitute for diesel.

4. **Understand the Production**: It is noted that one tree can produce approximately 3 liters of sap, which can be directly used in diesel engines.

5. **Conclusion**: Therefore, the sap of Copalfera langsdorffii is considered a good substitute for diesel oil.

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