Answer:
The  correct option is C
Step-by-step explanation:
From the question  the slope  AC is evaluated as
      [tex]m_1 = \frac{b-0}{a- (-c)}[/tex]
      [tex]m_1 = \frac{b}{a+c}[/tex]
And  the slope of line  CB is mathematically evaluated as
    [tex]m_2 = \frac{0-b}{c-a}[/tex]
    [tex]m_2 = \frac{b}{c-a}[/tex]
Now for lines that are perpendicular to each other then the product of their slope should be equal to  -1
So if  [tex]m ZC[/tex] [tex]= 90^o[/tex]
Then
   [tex]m_ *m_2 = -1[/tex]
i.e Â
   [tex][\frac{b}{a+ c} ] [\frac{b}{a-c} ] = -1[/tex]