Correct option is D
Correct Answer: D
Core grammatical rule involved
Rule: Correct use of “unless” (conditional logic)
· “Unless” already means “if not.”
· Using “unless + not” creates a double negation, which reverses or confuses the intended meaning.
Structure rule:
· Correct: unless + affirmative clause
· Incorrect: unless + negative clause
Part-wise analysis
Part (A): “We urge natives to continue seeking”
Structure check
· “Urge + object + to + verb” is a correct verb pattern.
Why correct
· “Urge” correctly takes an infinitive (“to continue seeking”).
· No tense or agreement issue.
Example
· Authorities urge citizens to remain calm.
Part (B): “medical care but avoid”
Structure check
· Parallel construction:
o to continue seeking medical care
o but avoid emergency departments
Why correct
· Parallel verbs “continue seeking” and “avoid” share the same subject.
· No grammatical imbalance.
Example
· She likes reading books but avoids watching TV.
Part (C): “emergency departments unless they”
Structure check
· “Unless” correctly introduces a conditional clause.
· Sentence flow is intact so far.
Why correct
· The conjunction “unless” is used appropriately to set an exception.
Example
· Do not call unless you need help.
Part (D): “do not have a life-threatening condition”
Error here
Why
· “Unless” already means “if not”.
· Adding “do not” results in double negation, changing the meaning illogically.
Meaning problem
· As written, the sentence suggests:
o Avoid emergency departments only when there is NO life-threatening condition, which is the opposite of the intended advice.
Rule violated
· Conditional clarity rule: avoid double negatives with “unless”.
Example
· Incorrect: Do not enter unless you do not have permission.
· Correct: Do not enter unless you have permission.
Corrected sentence
We urge natives to continue seeking medical care but avoid emergency departments unless they have a life-threatening condition.
Final Summary
· Error lies in Part (D).
· Cause: Double negation with “unless + do not”.
· Correction: remove “not”.
Final Answer: D