Which choice fits in the blank in this progressive era timeline? a) 1903- helen hunt jackson publishes regarding treatment of native americans b) 1906- upton sinclair publishes the jungle, criticizing the working conditions in the u. s. meat processing industry c) 1912- theodore roosevelt publishes the square deal in which he addresses problems in the treatment of american unions d) 1912- sir arthur conan doyle publishes the lost world showing the deforestation of the rain forests.

The correct answer is letter B.

Explanation:  Progressive Organizations that supported, in 1882 and 1924, Chinese immigration restriction laws. Several "progressive" unions were openly racist, nativity, and nationalist. Even the second incarnation of the Ku Klux Klan in the early twentieth century, besides being openly racist, also advocated several progressive reforms. Margaret Sanger, sexologist, feminist, abortion advocate and heroin of American progressives, even spoke at one of the KKK events

whose power in the senate is equal to the power of the speaker of the house?