The best answer to the query is B. They wanted a quick return to the former power and glory of Germany.
Many idealistic supporters of the Nazi party were motivated by a desire to restore Germany to its former status as a powerful and respected nation. After the aftermath of World War I and the Treaty of Versailles, many Germans felt humiliated and aggrieved. The loss of territory and significant reparations payments led to a sense of national decline. Adolf Hitler and the Nazi party capitalized on this sentiment by promoting a narrative of national rejuvenation and pride.
The annexation of Austria, known as the Anschluss, was seen by these supporters as a step towards unifying all ethnic Germans and reclaiming a greater German nation. It was a manifestation of their dreams of restoring Germany’s past glory and rectifying the perceived injustices of the post-war settlement. The other options, while they may hold some truth, do not capture the primary motivation of those idealistic supporters as directly as option B.
Thus, option B best encapsulates the motivation behind supporting Hitler's actions regarding Austria.