Fill in the blanks in the letter series “A_C_E_B_DE” by choosing the set of letters that produces a clear repeated pattern.

Introduction / Context:
This question supplies a partially hidden sequence of letters with blanks. You must pick the option that, when inserted, generates a clean, recognizable pattern. The letters A, B, C, D, and E strongly suggest a standard alphabetical run being obscured by the gaps.

Given Data / Assumptions:

• Base form of the sequence: A_C_E_B_DE • Options to fill the blanks: CADB, DBAC, BDAC, BADC. • Letters from an option are placed in order into the blanks. • The completed sequence should ideally display a simple familiar pattern such as a full repeated alphabet segment.

Concept / Approach:
The presence of A, C, E, B, and D scattered through the base strongly hints at the classic sequence A, B, C, D, E being broken up. A natural idea is that the full series might be ABCDEABCDE or similar. We therefore substitute each option and look for this kind of repetition.

Step-by-Step Solution:
Step 1: Substitute option (c) “BDAC”. Filling the blanks with B, D, A, C gives the series: ABCDEABCDE. Step 2: Recognize the pattern. The sequence ABCDEABCDE is a perfect repetition of the five letter block ABCDE. This is an extremely common and elegant pattern in reasoning questions. Step 3: Check that all letters appear in the correct order. First five letters: A, B, C, D, E. Next five letters: A, B, C, D, E again. There are no extra or misplaced letters, confirming the pattern.

Verification / Alternative check:
Test the other options. None of them produce ABCDEABCDE or any similar neat repetition. They result in sequences like ACCAEDBBDE or ADCBEABCDE, which contain duplicated or misordered letters. Only BDAC restores the exact alphabetic sequence twice, making it the unique and intended solution.

Why Other Options Are Wrong:
• CADB: This creates a sequence where the letters do not follow the precise alphabetical order and cannot be split cleanly into identical blocks. • DBAC: Leads to a partial completion of ABCDE but places letters in the wrong positions, causing local disorder. • BADC: Produces a string that looks somewhat structured but fails to give a full ABCDE repetition, leaving the overall pattern unclear.

Common Pitfalls:
Many learners stop after seeing something that looks roughly alphabetical without verifying whether every letter is in the correct sequence. Others do not check whether the pattern repeats exactly. For reasoning questions, strongly symmetric structures like ABCDEABCDE are much more likely than approximate patterns.

Final Answer:
The set of letters that correctly fills the blanks is BDAC, giving the complete sequence ABCDEABCDE.