When the mean value of variation is selected for, selection results.

a. disruptive

b. directional

c. stabilizing

d. no

The answer option "B" is correct

Stabilizing is when you want to see results for something where change is not a constant. 

The only one that seems to be correct is "B"

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it