Data Sufficiency

In the xy-plane, line k passes through the point (1,1) and line m passes through the point (1,-1). Are lines k and m perpendicular to each other?

1)Lines k and m intersect at the point (1,-1)
2)Line k intersects the x-axis at the point (1,0).

OA is E...can sum1 pls post a detailed explanation of the same??

I think it´s E

You need a another point of m to know if k & m are perpendicular.

IMO c as well...no info about m is given.

Should be E, as we need atleast 2 points on second line to determine its slope in x y plane