D. The hardships of the Great Depression made some people lose their faith in democratic systems.
Explanation:
This is the statement that best explains why the Great Depression helped totalitarian regimes to arise. During the Great Depression, many people experienced extreme hardship and suffering. This lead them to lose confidence in their government, and in its ability to protect them. In turn, this created the perfect opportunity for totalitarian regimes to arise.
Totalitarian regimes, and in particular fascist regimes, promised people a stronger government less prone to failure, which proved to be an attractive promise for many.
The Privileges and Immunities clause is addressed in the 14th amendment of the Constitution, which posits that no State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States.
The two variables needed to calculate demand are desire and willingness: Answer A is the closest option I could compare. If you disagree, feel free to choose another option.