Solution:
Step-1: Choose any two points on the line.
- My chosen points: (0,3) and (6,0)
 
Step-2: Find the slope of the line.
- y₂ - y₁/x₂ - x₁ = Slope
 - => 0 - 3/6 - 0 = Slope of line
 - => -3/6 = Slope of line
 - => -1/2 = Slope of line.
 
The result matches with Option C.
Option C is correct.