
Answer:
Face to face, mediated, small group.
Explanation:
Marco and his classmates engaged in face to face communication (they personally exchanged phone numbers), mediated (they spoke through the phone as well) and small group (because they were a few members). Those three types of communication occured during Marco's final papers preparation.
Face-to-face interaction: mutual influence of individuals’ direct physical presence. Being in the same place at the same time whilst interacting. In this case, during classes or outside classes.
Mediated communication: communication carried out by the use of communication technology. Through a phone, in this case.
Small group communication: interactions among three or more people who are connected through a common purpose. In this case, preparing the final paper for that class.