You can choose whether to reveal the results of the choice to the students, and if so, when.
In the example at the beginning of this section, Publish results was set to Always show results to students; this is why the student could see how many students had chosen each response. If it had been set to Do not publish results to students, the activity would not have shown how many students had selected each response.
If you limit the number of students who can choose a response, consider using Always show results to students. That way, the student can see how many others have chosen the response and how many slots are left for each response.