The use of pools and holding companies benefited which of these groups during the late 19th century and early 20th century

Answer

The Industrialists

Explanation

The late 19th century identified John D. Rockefeller and Andrew Carnegie as leading industrialists who transformed the American business practices from the unregulated federal government system to form that concentrated power into them. Through this process, industrialists were able to dominate the industry and limit competition. This was accomplished through development of pools, trusts, mergers and holding companies.

I think the answer would be industrialists