Your research paper is entitled "factors improving transportation in sacramento valley area." which sentence in paragraph 2 would be most as evidence in your paper? a) by the late 1840's dreams of a transcontinental railroad were debated. b) the transportation by a raft is symbolic of the role of transportation in the evolution of local history. c) but the shorter transcontinental crossing at the isthmus of panama by a railroad would occur first in 1855. d) meanwhile, the connection between san francisco and sacramento was improved by an expanding, fast, and efficient steamboat service.