Example: Walking in the park, Tom sees Jane after a long time in the park ...
Tom: How are you Jane? Long time, no see. Where have you been?
Jane: Actually I was on a long trip. How about you? Where are you working?
Tom: I'm running my own business.
Here, Tom is in the park, and sure he is not working then! He says "I'm running my own business." and means "these days I'm busy managing my own business."
In your example, I'd go for (A). It sounds better.