In the following sentence, one part may contain an error. Identify the part with the error; if the sentence is correct, select "No Error": Unless you don't obey (1) / your elders you (2) / will not succeed in your life. (3) / No Error (4).

Introduction / Context:
This question tests understanding of conditional clauses, especially the combination of the conjunction unless with negative expressions. Examinations frequently include such items because learners often use double negatives unintentionally. Correct handling of unless helps produce clear and concise conditional sentences in English.

Given Data / Assumptions:
The sentence is: Unless you do not obey (1) / your elders you (2) / will not succeed in your life. (3) / No Error (4). Segment 1 contains the expression Unless you do not obey. We assume that the intended meaning is that obedience to elders is a necessary condition for success, and the sentence should express that clearly, without unnecessary or confusing negatives.

Concept / Approach:
Unless itself carries a negative idea and can usually be replaced by if not. Therefore, combining unless with another explicit negative like do not often creates a double negative and results in a meaning that is different from what is intended. The expression Unless you do not obey literally suggests that if you obey, you will not succeed, which is the opposite of the intended meaning. To express the idea correctly, we must write Unless you obey your elders, you will not succeed in your life. Here unless introduces a positive verb form obey, and the result clause shows the negative consequence if the condition is not met.

Step-by-Step Solution:
Step 1: Rewrite unless as if not to check the meaning: If you do not obey your elders, you will not succeed in your life.
Step 2: Compare this with the original which has Unless you do not obey. This combination produces confusion.
Step 3: Remove the extra negative do not after unless to align the condition with the intended sense.
Step 4: The corrected first part becomes Unless you obey.
Step 5: Conclude that part 1 contains the error because of the unnecessary negative do not.

Verification / Alternative check:
The corrected sentence reads: Unless you obey your elders you will not succeed in your life. If we convert unless to if not, we get If you do not obey your elders, you will not succeed in your life, which clearly matches the intended message. This confirms that the corrected form expresses the requirement of obedience accurately. The original structure Unless you do not obey reverses the meaning and is therefore incorrect.

Why Other Options Are Wrong:
Part 2, your elders you, correctly places the object and the subject of the main clause. Part 3, will not succeed in your life, is a standard future tense clause expressing the consequence. Part 4, No Error, is only a label and is not itself in the sentence. Since only part 1 misuses the negative with unless, option A is the only correct choice for the location of the error.

Common Pitfalls:
Many learners mistakenly think that both unless and if not can be used with additional negatives, leading to structures like Unless you do not work hard, you will fail. This form actually suggests that working hard causes failure, which is not usually intended. Remember that unless is already negative, so it is generally followed by a positive verb form. Checking the sentence by replacing unless with if not is an effective technique to catch and correct double negatives in conditionals.

Final Answer:
The error is in part 1; the phrase should be Unless you obey, not Unless you do not obey.