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Let the complex number z =x +iy be such ...

Let the complex number `z =x +iy` be such that `(2z-3i)/(2z+i)` is purely imaginary. If `x+y^2=0`, then `y^4+y^2-y` is equal to:

A

`3/2`

B

`3/4`

C

`2/3`

D

`4/3`

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