How is Tanya related to the man in the photo graph?
I. Man in the photograph is the only son of Tanya's grandfather.
II. The man in the photograph has no brothers or sisters and his father is Tanya's grandfather.

Options

A. the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question,
B. the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question,
C. the data either in statement I alone or in statement II alone are sufficient to answer the question,
D. the data given in both statements I and II together are not sufficient to answer the question,

Explanation

To determine how Tanya is related to the man in the photograph, we will analyze the two statements provided separately and then combine the information.

### Step-by-Step Solution:

1. **Analyze Statement I:**
- The statement says that the man in the photograph is the only son of Tanya's grandfather.
- This means that Tanya's grandfather has one son, who is the man in the photograph.
- If the man in the photograph is the only son of Tanya's grandfather, then he is Tanya's father.
- Therefore, Tanya is the daughter of the man in the photograph.

2. **Analyze Statement II:**
- The statement says that the man in the photograph has no brothers or sisters and that his father is Tanya's grandfather.
- Since he has no siblings, this confirms that he is indeed the only son of Tanya's grandfather.
- Again, this means that the man in the photograph is Tanya's father.
- Therefore, Tanya is the daughter of the man in the photograph.

3. **Conclusion:**
- From both statements, we conclude that Tanya is the daughter of the man in the photograph.
- Thus, we can say that either statement alone is sufficient to answer the question.

### Final Answer:
Tanya is the daughter of the man in the photograph.