(A) ** Ohio
(B) Virginia
(C) Calorado
(D) Pennsylvania
EXPLANATIONS BELOW
Concept note-1: -No Republican has ever been elected president without winning Ohio. In 2004, Ohio was the tipping point state, as Bush won the state with 51% of the vote, giving him its 20 electoral votes and the margin he needed in the Electoral College for re-election.
Concept note-2: -Only two states, Nebraska and Maine, do not follow this winner-take-all method. In those states, electoral votes are proportionally allocated. Can a candidate win the electoral vote, but lose the popular vote? Yes.
Concept note-3: -Ford was the only person to serve as president without being elected to either the presidency or the vice presidency.
Concept note-4: -Ohio was won by Illinois Representative Abraham Lincoln (R–Kentucky), running with Senator Hannibal Hamlin, with 51.24% of the popular vote, against Senator Stephen A. Douglas (D–Vermont), running with 41st Governor of Georgia Herschel V. Johnson, with 43.30% of the popular vote.
Concept note-5: -If no candidate receives a majority of electoral votes, the Presidential election leaves the Electoral College process and moves to Congress. The House of Representatives elects the President from the 3 Presidential candidates who received the most electoral votes.