Question

The area of a triangle is 4 surface units, given that two of its vertexes are A(2,1) and B(3,-2). Knowing that the third vertex is on abscissa's axis, we can afirm that its coordinates are:

a) (-1/2,0) or (4,0)
b) (-1/3,0) or (5,0)
c) (-1/3,0) or (4,0)
d) (-1/2,0) or (5,0)

I understand this exercise and I even tried to draw it, but I just don't get the options. Help pls