Missing Number in the Given Responses

Given responses: MNOPWXYZRSTUBCD __?__

The missing letter can be found by analyzing the given letters. Here are the steps to solve the problem:

1. Divide the given letters into two groups: M to S and T to D.
2. Rearrange the letters in each group in alphabetical order: MNOPRSWXYZ and BCDTUS.
3. Combine the two groups: MNOPRSWXYZBCDTUS.
4. The missing letter should be between W and B. Therefore, it should be either A or E.
5. However, the letter A is already used in the first group, and the letter E is already used in the second group. Therefore, the missing letter must be E.

Therefore, the correct answer is option B.

Explanation in Details

To find the missing letter, we need to understand the pattern in the given responses. The first step is to divide the given letters into two groups: M to S and T to D. This is because the alphabet has 26 letters, and it is easier to analyze them in smaller groups.

Once we have divided the letters, we need to rearrange them in alphabetical order. This helps us to see the pattern more clearly. The first group (M to S) can be rearranged as MNOPRSWXYZ, and the second group (T to D) can be rearranged as BCDTUS.

Now, we can combine the two groups to get MNOPRSWXYZBCDTUS. By looking at this sequence, we can see that the missing letter should be between W and B. Therefore, it should be either A or E.

However, we need to check if these letters have already been used in the two groups. We can see that the letter A is already used in the first group (MNOPRSWXYZ), and the letter E is already used in the second group (BCDTUS). Therefore, the missing letter must be E.

In conclusion, the correct answer is option B, which is E.