You can use a choice activity to confirm the students' understanding of an agreement or to record their consent. For example, if you're teaching a film-making class and you anticipate entering the resulting film into student competitions, you can use a choice to record the students' consent to have their work submitted to the competition or you can write the course syllabus and schedule as the text of the choice, and have the student confirm that he/she has read the syllabus. In this case, you might want the choice to have only one response, indicating the student's agreement. If you have a response indicating the student's disagreement, enable them to change their response and decide how you will handle the disagreement.
You can also use a choice to survey the class about their readiness to proceed with an activity. This is especially useful if the class needs to coordinate their efforts. For example, if you're using one of Moodle's Workshop activities, you can have students...