Sociologist Georg Simmel suggested that small groups have distinctive interaction patterns that do not exist in larger groups. In a - (a group composed of two members) - the active participation of both members is crucial for the group's survival.

dyad  

Explanation:

In sociology, a dyad group is described as a group that contains only two member or people and is considered as the smallest social group that is being possible so far. However, according to many sociologists, the pair of individuals who are involved in a dyad group is said to be linked through "romantic interest, work, partners in crime, family relations, some other interests, and so on".

As per the question, the statement signifies a dyad group.                            

what are the choices? the multiple choices?

i will answer in the comments after the choices have been said.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.