What is the difference between a primary and a secondary source

Which option most accurately explains roosevelt’s motivation in forming the bull moose party? a. he thought that president taft had failed to continue his policies of progressive reform. b. he thought president taft’s conservation legislation was effective but poorly timed. c. he wanted to change president taft’s foreign policy toward asia. d. he saw that president taft focused on antitrust legislation to the exclusion of other reforms.

About how many european immigrants were processed at the facilities on ellis island

Can someone me write a paragraph on this topic i feel confused