Either can illustrate a signpost, depending no the nature of the signpost and the way in which you prefer to explore it. Option A sounds like the concern of the signpost in general. Option B sounds like a transition from one event (or signpost) to another. When looking at more internalized signposts (e.g. Convceiving, Memory, Understanding, etc.) an Option A-type exploration may be preferred. When more overtly action-related signposts (Doing, Obtaining, The Future, etc.) are explored, an Option-B style may be preferred.
FOR THE MC
There are many other story points than signposts and journeys that make up the plot. There are also the static plot points, the dynamics (plot and character), and the thematic points of each throughline, each of which need to be explored as you weave your story together.
For example, I could easily see your illustrations of Option B as being descriptions of the Story Driver (the first an Action, the second a Decision). The MC Signpost Option A example could just as easily be describing the MC Resolve and Story Judgment (Change(?) / Good).
So peppered WITHIN each throughline will be the illustrations for the the various story points appropriate to that throughline, which together populates plot and illustrates theme and character while doing so.