The determinant $\left| \begin{array}{ccc} a & b & a - b \\ b & c & b - c \\ 2 & 1 & 0 \end{array} \right|$ is equal to zero if $a, b, c$ are in

  • A
    $G. P.$
  • B
    $A. P.$
  • C
    $H. P.$
  • D
    None of these

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