Marie was trying to show her friend why -3 x -8 equals positive product this is what she wrote

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half

Can someone me with this problem . show your work .

Which one ? is the answer and how to find this answer