Hey there!!
A vertical line, if we imagine a graph and a vertical line passing right from it, we would see that this line is passing through the x-axis.
Vertical lines, as they are passing from x-axis, just has x-intercept but not y-intercept.
The slope of these type of lines is undefined.
The equation would look like:
x = ?
'?' accounts for the x-intercept.
Hence, the appropriate answer would be :
OPTION (B)
Hope my answer helps!