A social scientist conducts a study with 10 subjects. In which situations is a permutation necessary to determine the number of possible outcomes?

Select all that apply.

A. Create a seating chart for the 10 subjects around a table.

B. Invite 3 subjects to participate in a repeat study.

C. Schedule interviews for all 10 subjects.

D. Select 3 out of 6 sandwiches and 2 out of 4 desserts for the subjects' lunches.

E. Administer a survey to 6 of the subjects.

Help please
Im guessing A but not sure what else