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In the reaction, $\ \ \ \ \ \ \ \ \ \ \ \ \ \text{Br}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}_2\xrightarrow[\Delta]{\text{alc. KOH}}\text{A,} A$ is :

• ✓
  $ \mathrm{CH}_2=\mathrm{CH}_2 $
• B
  $ \mathrm{CH}_3 \mathrm{CH}_3 $
• C
  $\text{CH}\equiv\text{CH}$
• D
  Both $(a)$ and $(b)$