One of the Main Differences Between Descent Groups and Nuclear

One of the main differences between descent groups and nuclear families is that

A) descent groups are typically not involved with politics, while nuclear families are.
B) nuclear families are always exogamous, while descent groups are always endogamous.
C) descent groups are permanent, while nuclear families are not.
D) members of descent groups are called affines, while members of nuclear families are consanguines.
E) nuclear families are found only in industrial societies, while descent groups are found only in foraging societies.