Some of the letters are missing, which are given in that order as one of the options below it. Select the correct option.
_ _aba_ _ba__ab

Options

A. abbba
B. abbab
C. baabb
D. bbaba

Explanation

To solve the problem of filling in the missing letters in the sequence "_ _aba_ _ba__ab", we need to analyze the pattern of the letters and determine which option fits best.

### Step-by-Step Solution:

1. **Identify the Structure**:
We have the sequence: "_ _aba_ _ba__ab". We can break it down into segments where the letters are already given:
- The first part has two blanks before "aba".
- The second part has two blanks before "ba".
- The last part has one blank before "ab".

2. **Count the Letters**:
We need to fill in the blanks with letters that will create a consistent sequence. The total sequence has 12 positions (including the letters already given).

3. **Check Options**:
We will check the provided options one by one to see which one fits the sequence.

- **Option A**: A B _ _ A B A _ _ B A _ _ A B
- Filling in the letters: A B A B A B A B A B A B A
- This does not create a consistent pattern.

- **Option B**: A B A B A B A B A B A B A
- Filling in the letters: A B A B A B A B A B A B A
- This creates a consistent pattern of alternating A and B.

4. **Confirm the Pattern**:
After filling in the letters from Option B, we can see that the sequence maintains a consistent alternating pattern of A and B:
- The sequence becomes ABABABABABAB, which is a clear and repetitive pattern.

5. **Conclusion**:
The correct option that fits the sequence is Option B.

### Final Answer:
The correct option is **Option B**.