C, Yorktown because the French went to Yorktown to join the colonists and fight with them
The Middle Ages was a time of extreme religious devotion and only one religion was accepted in Europe: Christianity, and also only one church was considered proper: the Roman Catholic Church. A heretic would be anyone who would challenge in any way anything that the church was saying. (even that the Earth rotates around the Sun).
Carter continued, initiated by Richard Nixon's policy of normalizing relations with Beijing. January 1, 1979 the United States established full diplomatic relations with the Peoples Republic of China, thus withdrawing support for Taiwan.
The nullification crisis was resolved when Congress revised the tariff that had caused South Carolina to declare nullification; then, the state was able to accept the compromise without losing their respect and pride. However, the nullification crisis would not be fully resolved until the Civil War, when the national government left dual federalism and entered into cooperative federalism, thereby limiting the state's power to challenge the national government's authority.