The lines y=mx, y+2x=0, y=2x+k and y+mx=...

The lines `y=mx, y+2x=0, y=2x+k` and `y+mx=k` form a rhombus if m is equal to :

A

`-1`

B

`1/2`

C

1

D

2

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The correct Answer is:

D

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