Tapeworms are self fertilizing in which :

Options

A. the sperm produced in the tests of one individuals can fertilize the eggs produced by the same individual
B. the sperm produced in the testes of one individual can fertilize the eggs produced by different individual
C. the sperm of one individual fertilizes te eggs of different species
D. the ova of one individual fertilizes the sperm of different genera

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the self-fertilization process in tapeworms. We need to identify the correct statement regarding how tapeworms reproduce.

2. **Identifying Key Terms**: The term "self-fertilizing" indicates that an organism can fertilize its own eggs with its own sperm. Tapeworms are known to be hermaphrodites, meaning they possess both male and female reproductive organs.

3. **Analyzing the Options**:
- **Option A**: "The sperm produced in the testers of one individual can fertilize the egg produced by the same individual."
- **Option B**: "The sperm produced in the testers of one individual can fertilize the egg produced by a different individual."
- **Option C**: "Sperm of one individual fertilizes the egg of different species."
- **Option D**: "The ovum of one individual fertilizes the sperm of a different gender."

4. **Evaluating Option A**: This option correctly describes self-fertilization. Since tapeworms have both male and female reproductive organs, the sperm from one individual can indeed fertilize its own eggs.

5. **Evaluating Option B**: This option describes cross-fertilization, which is not applicable to self-fertilizing organisms like tapeworms.

6. **Evaluating Option C**: This option suggests interspecies fertilization, which is not a characteristic of tapeworm reproduction.

7. **Evaluating Option D**: This option also describes a scenario that does not apply to tapeworms, as it involves different genders rather than self-fertilization.

8. **Conclusion**: The correct answer is **Option A**, as it accurately describes the self-fertilizing nature of tapeworms.

### Final Answer:
**Tapeworms are self-fertilizing in which the sperm produced in the testers of one individual can fertilize the egg produced by the same individual (Option A).**