In this context, “work” refers to B - a place where a person goes specifically to do their job.
A’s statement, “I got a promotion at work,” implies the workplace where they perform their job. It is not referring to the act of working (option A), but rather the location or setting of their job.
What does “earlier” mean here? Does it mean the same as early?
Here, “earlier” means at a previous time (specifically, earlier in the week). It does not mean the same as “early,” which generally refers to a time before the expected or usual time.
Example of “earlier”: “I got a promotion earlier this week” = “I got a promotion at a prior time this week.”
Example of “early”: “I arrived early for the meeting” = “I arrived before the scheduled time for the meeting.”
In short, “earlier” relates to a point in time in the past, while “early” relates to being ahead of a usual or expected time.