Correct answer: 4
The condition a^2 + b^2 + c^2 = 0 implies that the complex numbers a, b, and c are related in such a way that their squares sum to zero, leading to specific geometric interpretations. By analyzing the expression |b^2 + c^2 ab ac| |ab c^2 + a^2 bc| under this constraint, it can be shown that the value of k simplifies to 4, confirming that the correct option is indeed 4.