From the student's point of view, a choice activity looks like this:

Note a few things about this choice activity:

• The student can see how many other students have chosen a response
• There is a limit on the number of students who can choose each response
• The student can remove their choice and submit again

These are options that you can set for the activity. The teacher also could have hidden other students' responses, had no limit for the number who can choose each response, and prevented the student from changing their response.