What does '$b$' represent in the given diagram?

  • A
    $CH_{4}, NH_{2}, H_{2}S, He$
  • B
    $CH_{4}, NH_{3}, H_{2}O, H_{2}$
  • C
    $CH_{4}, NH_{3}, He, H_{2}$
  • D
    $CH_{4}, CO_{2}, H_{2}O, H_{2}$

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