Let A, B, C represent the complex numbers z1, z2, z3 respectively on the complex plane. If the circumcentre of the triangle. ABC lies at the origin then the orthocenter is represented by the complex number:
(A) z1 + z2 – z3
(B) z2 + z3 – z1
(C) z3 + z1 – z2
(D) z1 + z2 + z3
