Answer:
Aspirational Reference Group
Step-by-step explanation:
Aspirational reference group is a group which is made up of individuals with the same aims and objectives in which a person wish to join the group by trying to do what the group members were doing in term of their attitude and behaviour.
Just as in the case of Ben who his interested in joining a group in which he is not a member but trying to copy the way Ryan run so that he can participate in marathons and become a member of Ryan club.
Therefore Marathon Runners Club can be categorized as a ASPIRATION REFERENCE GROUP