Answer :
Final answer:
The 'dynamo of Indiana culture' mentioned in the 1938 Reader's Digest is Wilfred Bain, who was pivotal in advancing cultural and music education in Indiana. The correct option is b) Wilfred Bain.
Explanation:
The individual referred to in the 1938 Reader's Digest article as 'The dynamo of Indiana culture, the man who is striving to bring culture to the crossroads' is Wilfred Bain. Neither Herman B Wells, Thomas Hart Benton, nor Albert Einstein is the correct answer, as these individuals were known for different contributions.
Herman B Wells was a university president who greatly expanded Indiana University, Thomas Hart Benton was a U.S. Senator influential in the concept of Manifest Destiny, and Albert Einstein was a renowned physicist known for his work in theoretical physics and his influence on the development of nuclear weapons through the Einstein-Szilard letter. Thus, Wilfred Bain, as a music educator and innovator, fits the description provided by the question in relation to Indiana culture.