Which of the following best describes the main way that upton sinclair gathered research for the jungle?
he hired investigators to spy on activities in a meat-packing plant.
he spent two years doing research in libraries all over america.
he went undercover as a worker in a meat-packing plant.
he interviewed experts in the meat-packing industry.

the correct answer is c.

upton sinclair was an american journalist and the author of 'the jungle", a controversial book about existing working conditions in a meat-packing company in chicago. the novel was written in 1904 and its primary purpose was to advocate socialism in the usa, thus concentrating on the unfair and harsh treatment of many immigrants as a capitalist way of exploiting poor, working-class people.

as a journalist, sinclair exposed corruption in politics and business. gathering information for 'the jungle', he spent seven years working incognito in one of chicago's meat packing plants. however, contrary to many statements, he did not go undercover as a meat packer. his deception was to carry a dinner pail through the packinghouse, escorted by workers, so that he looked liked he belonged.

i really really really really really really dont know