The locus of $z$ satisfying the inequality $\left|\frac{z+2 i}{2 z+i}\right| < 1$,where $z=x+i y$,is
- A$x^2+y^2 < 1$
- B$x^2-y^2 < 1$
- C$x^2+y^2 > 1$
- D$2 x^2+3 y^2 < 1$
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