The correct answer to this open question is the following.
Although there are no options provided, we can answer the following.
One cause behind the push for new federalism was the perceived increase in the autonomy and power of the states.
One of the most important characteristics of this new federalism in the United States was that the federal government gave the states more autonomy in many fields and transferred some powers to make their own decisions according to their necessities. Let's have in mind that, when President Franklin D. Roosevelt created the "New Deal" programs to help the poor American people during the Great Depression years, he allowed the federal government to accumulate a great deal of power in his New Deal programs. That is why the new federalism changed the way things were and took into consideration the needs of the states.