Answer:
Option B) Slope = -1
Step-by-step explanation:
For a line passing thru any two points, (x₁, y₁) and (x₂, y₂), its slope is:

Here, the points are (2, 8) and (4, 6)
therefore,
slope = 
= 
= -1
[NOTE: Here, I'm taking (2, 8) as (x₁, y₁), you can take (4, 6) as the latter. The answer obtained in both the cases will be the same.]