If $x, y, z$ are in an arithmetic progression,and $a$ is the arithmetic mean of $x$ and $y$,and $b$ is the arithmetic mean of $y$ and $z$,then what is the arithmetic mean of $a$ and $b$?

  • A
    $x$
  • B
    $y$
  • C
    $z$
  • D
    $x + z$

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