The correct answer is B) promoting participation.
In this conversation, the group discussion technique that Jennifer most clearly shows is promoting participation.
When you are discussing in the workplace or any other environment, there are discussion techniques aimed to get an understanding of every part involved in the discussion and at the end, get the proper solution.
In this case, the technique Jennifer is using is to promote participation when asking Anna, to express her thought. With this, Jennifer is showing goodwill and that she doesn't want to impose anything, but promote the open expression of opinions.