If the amplitude of $z - 2 - 3i$ is $\pi / 4$,then the locus of $z = x + iy$ is
- A$x + y - 1 = 0$
- B$x - y - 1 = 0$
- C$x + y + 1 = 0$
- D$x - y + 1 = 0$
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