If the complex numbers $z_1, z_2, 0$ are vertices of an equilateral triangle,then $z_1^2 + z_2^2 =$
- A$2 z_1^2 z_2^2$
- B$z_1^2 z_2^2$
- C$2 z_1 z_2$
- D$z_1 z_2$
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