In a row of five children A, B, C, D and E, who is standing in the middle?
I. D is to the immediate right of E and B is to the immediate left of E.
II. B is at the extreme left of the row.

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 in both statements I and II together are necessary to answer the question.

Explanation

To determine who is standing in the middle of the row of five children A, B, C, D, and E, we will analyze the information given in both statements step by step.

### Step-by-Step Solution:

1. **Analyze Statement I**:
- The first statement tells us that "D is to the immediate right of E" and "B is to the immediate left of E."
- We can represent this information as follows:
- B, E, D (in that order).
- However, we still have two children (A and C) whose positions are unknown. Therefore, we cannot definitively determine who is in the middle based on this statement alone.

**Hint for Step 1**: Look for relationships between the positions of the children based on the information provided.

2. **Analyze Statement II**:
- The second statement states that "B is at the extreme left of the row."
- This means B is in position 1.
- Now, we can combine this with the information from Statement I:
- Since B is at the extreme left, we can place B in position 1, and from Statement I, we know that E must be in position 2 and D in position 3 (immediate right of E).
- This gives us: B (1), E (2), D (3).
- We still have A and C left, which can occupy positions 4 and 5. Regardless of whether A is in position 4 or 5, D will always be in position 3.

**Hint for Step 2**: Determine the implications of one statement and see how it interacts with the other statement.

3. **Conclusion**:
- From the analysis, we see that D is always in the middle position (position 3) when we consider both statements together.
- Therefore, the child standing in the middle is **D**.

**Hint for Step 3**: Combine the information from both statements to arrive at a conclusion.

### Final Answer:
D is standing in the middle of the row.