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
  $2 x^2+3 y^2 < 1$