Answer:
Option A. The main purpose of the transition word in the sentence: "Meanwhile, Jacey waited for the fitting room to become available." is that it connects a series of similar events.
Step-by-step explanation:
Meanwhile can be defined as the time before something happens or before something ends, it is another way to say "during this time". When using meanwhile as a transition word in a sentence the writer is trying to say that at the same time, or during, something is happening, another thing is also happening, that most likely relates to the first thing mentioned. This is to say that while Jacey waited for the fitting room to become available, a similar event was also occurring, that was connected to Jacey's actions by the word "meanwhile".