The following questions are based on letter series in which some letters are missing. The missing letters are given in a proper sequence as one of the alternatives among the given four alternatives under each question
c-bbb-- abbbb-abbb-

Options

A. aabcb
B. abccb
C. ababb
D. bacbb

Explanation

To solve the given letter series problem, we need to identify the pattern in the sequence and fill in the missing letters accordingly. The series provided is:

C - B - B - B - _ - A - B - B - B - _ - A - B - B - B - _ - A - B - B - B - _ - A

### Step-by-Step Solution:

1. **Identify the Pattern**:
The series has a repeating pattern. We can see that after every group of B's, there is an A. The sequence starts with C followed by a group of B's and then an A.

2. **Count the B's**:
- The first group has 3 B's: C - B - B - B
- The second group has 4 B's: A - B - B - B - B
- The third group has 4 B's: A - B - B - B - B
- The fourth group has 4 B's: A - B - B - B - B

3. **Fill in the Missing Letters**:
- The first missing letter (after the first group of B's) should be a B, as we have 3 B's in the first group.
- The second missing letter (after the second group of B's) should be an A, as it follows the pattern of having an A after a group of B's.
- The third missing letter (after the third group of B's) should again be a B.
- The fourth missing letter (after the fourth group of B's) should be an A.

4. **Construct the Complete Series**:
Now, we can rewrite the series with the missing letters filled in:
C - B - B - B - B - A - B - B - B - A - B - B - B - A - B - B - B - A

5. **Identify the Final Sequence**:
The complete sequence is:
C - B - B - B - B - A - B - B - B - A - B - B - B - A - B - B - B - A

6. **Find the Missing Letters**:
The missing letters in the sequence are: B, A, B, A.

### Final Answer:
The missing letters in the sequence are: **A, B, C, C, B**.