I have 9 letters. Nobody can read without me. Letters 4, 5 and 6 form an animal. Letter 7 is me. Letter 3 is you. Letters 2, 8, 9 and 1 together mean "completed". Who am I?

Introduction / Context:
This is a structured letter position riddle that encodes many clues inside a single nine letter word. Each part of the description refers to specific positions within that word and to the meanings of smaller sequences. At the same time, the overall word must fit the clue Nobody can read without me, which points toward something essential for reading skills. Combining all of these hints leads to the word Education.

Given Data / Assumptions:

• The word has 9 letters in total.
• Nobody can read without this concept.
• Letters 4, 5 and 6 together form the name of an animal.
• Letter 7 represents me, the speaker.
• Letter 3 represents you.
• Letters 2, 8, 9 and 1 together form a word that means completed.

Concept / Approach:
Education is a nine letter word that fits the general clue about reading, because people learn to read through education. To verify, we check each position based clue. In the spelling E D U C A T I O N, letters 4, 5 and 6 are C, A and T, forming cat, which is an animal. The seventh letter is I, which can stand for I, the speaker. The third letter is U, which sounds like you. Letters 2, 8, 9 and 1 are D, O, N and E, forming done, which means completed. These checks show that Education satisfies every condition precisely.

Step-by-Step Solution:
Step 1: List the letters of the candidate word Education in order: 1 E, 2 D, 3 U, 4 C, 5 A, 6 T, 7 I, 8 O, 9 N. Step 2: Confirm that Education has 9 letters, meeting the first requirement. Step 3: Apply the overall meaning clue Nobody can read without me. Education is essential to learning how to read, so this fits well. Step 4: Check letters 4, 5 and 6: C, A and T form the animal cat, which matches the animal clue. Step 5: Check letter 7: the seventh letter is I, which in English is used by a speaker to refer to themselves, so letter 7 is me. Step 6: Check letter 3: the third letter is U, which sounds like you when spoken, satisfying the letter 3 is you clue. Step 7: Check letters 2, 8, 9 and 1: D, O, N and E can be rearranged in that given order to form done, a word meaning completed.

Verification / Alternative check:
Examine the other options. Literature and Dictionary are also related to reading, but their letter arrangements do not produce cat at positions 4 to 6 or done from the specific positions. Dedication shares some letters but again fails the detailed tests. Only Education passes every positional and meaning clue. This combination of a strong semantic fit with perfect letter based matches confirms that Education is the intended answer beyond doubt.

Why Other Options Are Wrong:
Literature: It has more than 9 letters and does not yield cat or done in the specified positions.
Dictionary: This word also fails the letter position constraints and has a different length.
Dedication: While it is nine letters long, the internal patterns do not produce the required animal and words at the indicated positions.
None of these: This is incorrect since Education matches every clue exactly.

Common Pitfalls:
Some learners focus only on the reading clue and choose Dictionary, forgetting to check the detailed letter hints. Others may try to force another nine letter word to fit but overlook one of the positional conditions. Problems of this type require both general knowledge and careful, step by step verification. Writing the letters out with their positions and checking each clue against them is the most reliable method. With practice, you will recognise that Education is a classic solution to this specific riddle format.

Final Answer:
The nine letter word that satisfies all the clues is Education.