Rhizosphere microflora exhibits:

Options

A. Parasitism
B. Symbiosis
C. commensalism
D. Space parasitism

Explanation

### Step-by-Step Solution:

1. **Understanding the Rhizosphere**:
- The rhizosphere is defined as the narrow region of soil that is directly influenced by root secretions and the associated soil microorganisms. This area is crucial for plant growth and health.

2. **Identifying Microflora**:
- The microflora present in the rhizosphere includes various bacteria and other microorganisms. These organisms play a significant role in the soil ecosystem and plant health.

3. **Role of Root Secretions**:
- Roots secrete various substances, including proteins and sugars, which are known as rhizodeposition. These secretions serve as nutrients for the soil microorganisms.

4. **Types of Interactions**:
- The interactions between the rhizosphere microflora and the plant roots can be classified into different types: parasitism, symbiosis, commensalism, and space parasitism.
- **Parasitism**: One organism benefits at the expense of another.
- **Symbiosis**: A mutually beneficial relationship between two different organisms.
- **Commensalism**: One organism benefits while the other is neither helped nor harmed.
- **Space Parasitism**: This term is not commonly used in ecological interactions.

5. **Determining the Correct Interaction**:
- The relationship between rhizosphere microflora and plant roots is primarily symbiotic. The microorganisms benefit from the nutrients provided by the plant, while the plant benefits from the enhanced nutrient uptake and protection against pathogens.

6. **Conclusion**:
- Based on the interactions described, the correct answer to the question is option B, symbiosis. Rhizosphere microflora exhibit symbiosis.