What is the number of carbon atoms in the longest chain of the given compound?
$CH_3 - CH_2 - CH_2 - C(=O) - CH(CHO) - CH_2 - CH_3$ (Note: The structure provided in the input was interpreted as a heptane derivative with a substituent).

  • A
    $7$
  • B
    $5$
  • C
    $4$
  • D
    $6$

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