All favour the process of decomposition except

Options

A. sugar rich detrius
B. absence of oxygen
C. warm temperature
D. no exception, as all given factors favour it

Explanation

To solve the question "All favor the process of decomposition except," we need to analyze the given options and determine which one does not support the process of decomposition.

### Step-by-Step Solution:

1. **Understand Decomposition**:
- Decomposition is the process by which dead organic substances are broken down into simpler forms. This process is essential for recycling nutrients in the ecosystem.

2. **Identify Factors Favoring Decomposition**:
- The factors that generally favor decomposition include:
- **Presence of Oxygen**: Oxygen is crucial for aerobic decomposition, which is the breakdown of organic matter by microorganisms that require oxygen.
- **Warm Temperature**: Higher temperatures can enhance microbial activity, leading to faster decomposition.
- **Nutrient-Rich Material**: Materials rich in nitrogen and sugars (like sugar-rich detritus) promote microbial growth and activity, speeding up the decomposition process.

3. **Analyze Each Option**:
- **Option A: Sugar-rich detritus**: This favors decomposition as it provides nutrients for microorganisms.
- **Option B: Absence of oxygen**: This does not favor decomposition because most decomposers require oxygen to break down organic matter effectively.
- **Option C: Warm temperature**: This favors decomposition by promoting microbial activity.
- **Option D: No exception as all given factors favor it**: This is incorrect since we have identified an exception.

4. **Conclusion**:
- Based on the analysis, the factor that does not favor the process of decomposition is **Option B: Absence of oxygen**.

### Final Answer:
**B. Absence of oxygen**