Which of the following methods of contreception prevents ovulation?

Options

A. Pills
B. Depo-provera
C. Norplant
D. All the above

Answer

To solve the question "Which of the following methods of contraception prevents ovulation?" we will analyze each option provided:

### Step-by-Step Solution:

1. **Understanding Contraception**:
- Contraception refers to methods used to prevent pregnancy. It can be classified into natural and artificial methods. Natural methods have fewer side effects, while artificial methods may have more side effects but are more effective in preventing pregnancy.

2. **Analyzing the Options**:
- **A. Pills**:
- Birth control pills contain hormones that suppress ovulation. By preventing the release of eggs from the ovaries, these pills effectively prevent fertilization.
- **B. Dipoprovera**:
- Dipoprovera is a hormonal injection that also works by suppressing ovulation. It releases hormones that inhibit the ovarian cycle, preventing the release of eggs.
- **C. Norplants**:
- Norplants are hormonal implants that release hormones over time to prevent ovulation. They work similarly to pills and injections by inhibiting the release of eggs.
- **D. All of the above**:
- Since all three methods (pills, Dipoprovera, and Norplants) prevent ovulation, this option suggests that all listed methods are effective in preventing ovulation.

3. **Conclusion**:
- Since all three methods mentioned (pills, Dipoprovera, and Norplants) are effective in preventing ovulation, the correct answer is **D. All of the above**.

### Final Answer:
**D. All of the above**