Which of these processes occurs in the cytosol?

Options

A. Krebs cycle
B. Glycolysis
C. Electron transport system
D. Transition reaction

Explanation

### Step-by-Step Solution

1. **Understanding the Question**: The question asks which of the given processes occurs in the cytosol. The processes listed are Krebs Cycle, Glycolysis, Electron Transport System, and Transition Reaction.

2. **Identify the Processes**:
- **Krebs Cycle**: This process occurs in the mitochondria, specifically in the mitochondrial matrix.
- **Glycolysis**: This process occurs in the cytosol (or cytoplasm) of the cell.
- **Electron Transport System (ETS)**: This process occurs in the inner mitochondrial membrane.
- **Transition Reaction**: This process occurs in the mitochondria, linking glycolysis to the Krebs Cycle.

3. **Analyzing Each Option**:
- Since the question is about which process occurs in the cytosol, we need to focus on the processes that are not in the mitochondria.
- Glycolysis is the only process that occurs in the cytosol.

4. **Conclusion**: Based on the analysis, the correct answer is **Glycolysis**.