Theodore roosevelt was nominated for vice-president because a. he had campaigned energetically for the post. b. mark hanna wanted him. c. the new york bosses schemed to get rid of him. d. his conservatism would offset mckinley's liberalism.

Roosevelt didn't want to be vice president because he saw it as a do-nothing job.

This article provides an excellent answer.

http://www.senate.gov/artandhistory/history/common/generic/VP_Theodore_Roosevelt.htm