The right answer is:
There’re only a few people, aren’t there?
It’s always the opposite:
If the sentence is POSITIVE, you use aren’t (negative), and if the sentence is Negative, you us are they?
The same goes for isn’t he/is he?
- They are very good friends, aren’t they?
- They aren’t very good friends, are they?
- He is an excellent driver, isn’t he?
- She isn’t a great dancer, is she?