Answer: B. [tex]\dfrac{-1}{2}[/tex]
Step-by-step explanation:
In the given picture, we have two lines area parallel, one is red and other is green.
We know that the slopes of parallel lines are equal.
Therefore, if the green line has a slope of [tex]\dfrac{-1}{2}[/tex] then ,the slope of red line will also be [tex]\dfrac{-1}{2}[/tex] because they are parallel.
Hence, B is the correct option.
