The interaction in which both species are harmed is

Options

A. Competition
B. Commensalism
C. Amensalism
D. Mutualism

Answer

### Step-by-Step Text Solution:

1. **Understanding the Question**: The question asks for the type of interaction where both species involved are harmed.

2. **Analyzing the Options**:
- **Option A: Competition** - This interaction occurs when two or more species compete for the same resources (like food, space, or light). In this scenario, both species can suffer because they are trying to utilize the same limited resources.
- **Option B: Commensalism** - In this interaction, one species benefits while the other is neither helped nor harmed. This does not fit the criteria of both species being harmed.
- **Option C: Amensalism** - Here, one species is harmed while the other remains unaffected. This also does not meet the requirement of both species being harmed.
- **Option D: Mutualism** - In mutualism, both species benefit from the interaction. This is the opposite of what the question is asking.

3. **Identifying the Correct Answer**: Based on the analysis, the only interaction where both species are harmed is **Option A: Competition**.

4. **Conclusion**: Therefore, the correct answer to the question is **Competition**.