Question:

Identify the sentence that does not fit in the paragraph:
A. Urban planners increasingly recognize that walkable cities improve both physical and mental well-being.
B. Several studies indicate that green spaces in cities contribute to lower stress levels.
C. Public transportation systems are often designed to optimize fuel efficiency.
D. Compact city design reduces car dependency and encourages healthier lifestyles.
Question:
Which sentence is the odd one out?

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When identifying the odd one out, look for sentences that shift the theme—either in purpose, tone, or topic—compared to the main idea expressed by the other sentences.
Updated On: Jul 4, 2026
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Approach Solution - 1

Approach: Name the single thread that binds the majority of sentences, then spot the one that wanders off it.

Step 1 \(-\) find the common theme: A (walkable cities improve well-being), B (green spaces lower stress) and D (compact design encourages healthier lifestyles) all link urban design to human health and well-being.

Step 2 \(-\) test C against it: C says public transport is designed to optimise fuel efficiency. Its concern is energy/engineering, not health or well-being. It shares the "city" backdrop but not the controlling idea.

Step 3 \(-\) confirm: Remove C and A-B-D still read as one coherent point about health-driven urban design. Remove any of A, B, D and the health theme weakens. So C is the intruder.

Why the others fit: A, B and D each give a distinct mechanism (walkability, greenery, reduced car dependency) for the same well-being outcome; none is off-topic.

\[\boxed{\text{Odd one out: C.}}\]
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Approach Solution -2

Ask what each sentence is actually measuring. A measures well-being (physical and mental), B measures stress levels, D measures lifestyle healthiness — three different measurements, but all three are outcomes lived by people. C, in contrast, measures fuel efficiency — an engineering or energy outcome that lives in the transport system, not in a person's body or mind.

Since the paragraph is built around outcomes experienced by residents, and only C reports an outcome experienced by machinery instead, C is the sentence that does not belong.
\[ \boxed{\text{C}} \]
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