which of the following is the best definition of a vertical asymptote

Answer: Option A: A vertical line that the line of the graph aproaches but never intecepts it.
Step-by-step explanation:
An asymptote is a graph line that aproaches infinitely to something (in this case a vertical line), but it does not touch it (so never intercepts the graph).
This means that the graph aproaches but never intercepts the line, so the correct answer is A.