1.(x+3)(x + 2i)(x - 2i) = 0 has roots -3, -2i, 2i
2.x3-3x2+4x-12=0 has roots 3, -2i, 2i
3.(x+3)(x2+4)=0 has roots -3, -2i, 2i
4. x3+3x2+4x+12=0 doesn't have any rational solutions.
So there are two correct answers, 1 and 3. They both have solutions -3, -2i, 2i.
Edwin