All eukaryotic unicellular organisms belong to

Options

A. Monera
B. Protista
C. Fungi
D. Bacteria

Explanation

To answer the question "All eukaryotic unicellular organisms belong to," we will analyze the options provided and determine which group includes all eukaryotic unicellular organisms.

### Step-by-Step Solution:

1. **Understand Eukaryotic Organisms**:
- Eukaryotic organisms are characterized by having a well-developed nucleus and membrane-bound organelles. This distinguishes them from prokaryotic organisms, which lack these features.

2. **Define Unicellular Organisms**:
- Unicellular organisms consist of a single cell. This means that all the life processes are carried out within that one cell.

3. **Examine the Options**:
- **Monera**: This group includes prokaryotic organisms like bacteria, which do not have a well-developed nucleus or organelles. Therefore, Monera cannot include eukaryotic unicellular organisms.
- **Protista**: This group is known to include unicellular eukaryotic organisms. Organisms in this group can be autotrophic (like algae) or heterotrophic (like protozoa).
- **Fungi**: While fungi are eukaryotic, most are multicellular. The only unicellular fungus is yeast, which is an exception and does not represent the entire group.
- **Bacteria**: Bacteria are prokaryotic and, like Monera, do not have a well-developed nucleus or organelles.

4. **Identify the Correct Group**:
- Since Protista is the only group that includes unicellular eukaryotic organisms, we can conclude that the correct answer is **Protista**.

### Final Answer:
All eukaryotic unicellular organisms belong to **Protista**.

---