Read the following context and choose the best option to answer the question.
Context: My favorite part of the conference ? Going out to dinner * with a few folks including a local ( Bay Area ) cheesemaker . The restaurant had family style seating and we were seated next to a local chef .
Question: What may be a fact about their trip ?
Options: 
- They had went with their bosses .
 - They had went to a local conference .
 - They are on a long stay business trip .
 - They were on a business trip .


They were on a business trip .