President roosevelt's first reaction to upon sinclair's the jungle is best described as

Disbelief and distrust of Sinclair’s claims.

Explanation:

This was Roosevelt's first reaction to Sinclair's book The Jungle. Sinclair wrote about a group of immigrants who worked in the meat-packing industry. The book portrayed extremely harsh work conditions, cruel bosses and difficult lives. However, it also discussed the problems of the meat-packing industry, which included extremely unsanitary conditions. Upon reading the novel, Roosevelt's expressed disbelief and distrust. However, the book did motivate the government to ensure better overview of the sanitation of these packing facilities.

workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.