Concept:
In fibre cross-section analysis, the odd one out is identified based on geometric structure, symmetry, and internal arrangement of voids or lobes. A cross-section that deviates from the common structural pattern of the remaining samples is considered the odd one.
Step 1: Observe the given cross-sections.
Among the four given figures, three cross-sections show a similar type of structural formation with repeating rounded/looped patterns and relatively uniform internal arrangement.
However, one cross-section shows a distinctly different geometry and arrangement of internal structure.
Step 2: Identify structural difference.
The first cross-section (Option 1) exhibits a different fibre arrangement compared to the others. It does not follow the same repeating structural pattern seen in Options 2, 3, and 4.
\[
\text{Option 1} \neq \text{Common structural pattern of others}
\]
Step 3: Compare options.
• Option 2 → similar looped/structured pattern
• Option 3 → similar repeating structural geometry
• Option 4 → comparable patterned cross-section
• Option 1 → structurally different
Step 4: Final selection.
Thus, the odd cross-section is:
\[
\boxed{\text{Option (A)}}
\]
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