What are methanides?

  • A
    $Mg_2C_3, Be_2C, Al_4C_3$ and $CaC_2$
  • B
    $Mg_2C_3, Be_2C$ and $Al_4C_3$
  • C
    $Be_2C, Al_4C_3$ and $CaC_2$
  • D
    $Be_2C$ and $Al_4C_3$

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