Which feature would most likely help an experimental subject detect that the person conducting the experiment and asking questions has been swapped out for another person while a distraction occurs?

The new person is wearing the same clothing as the swapped person.

The subject is wearing glasses.

The swapped person is in the same age group as the subject, but the new person is much older.

The new person has the same hair color as the swapped person

The new person is the same height as the swapped person.