Cytokinesis refers to:

Options

A. division of nucleus
B. division of chromosomes
C. division of cytoplasm
D. none of these

Answer

**Step-by-Step Solution:**

1. **Understanding Cytokinesis**: Cytokinesis is a biological process that occurs at the end of cell division. It is specifically the phase where the cytoplasm of a parental cell is divided into two daughter cells.

2. **Identifying the Phases of Cell Division**: The cell cycle consists of several phases: G1, S, G2, and M phase. The M phase includes both mitosis (which is the division of the nucleus) and cytokinesis.

3. **Differentiating between Karyokinesis and Cytokinesis**: Karyokinesis refers to the division of the nucleus, which occurs during the M phase of the cell cycle. After karyokinesis, cytokinesis takes place, which is the division of the cytoplasm.

4. **Evaluating the Options**:
- **Option A (division of nucleus)**: This refers to karyokinesis, not cytokinesis.
- **Option B (division of chromosomes)**: This is related to the separation of chromosomes during anaphase of mitosis, not cytokinesis.
- **Option C (division of cytoplasm)**: This correctly describes cytokinesis, as it is the process that divides the cytoplasm after the nucleus has been divided.
- **Option D (none of these)**: This is incorrect since option C is the right answer.

5. **Conclusion**: Based on the definitions and the evaluation of the options, the correct answer is **C. division of cytoplasm**.