Argument of z1 z2:
Aarg(z1) + arg(z2) (modulo 2π)
Barg(z1)/arg(z2)
Carg(z1) - arg(z2)
Darg(z1) × arg(z2)
Answer & Solution
Correct answer: A. arg(z1) + arg(z2) (modulo 2π)
arg(z1 z2) = arg(z1) + arg(z2) (mod 2π). So multiplying complex numbers adds their arguments and multiplies their moduli. Geometric: rotation and scaling.
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