Answer:
A. Thomas Jefferson and Aaron Burr each received the same number of electoral votes. The House chose Jefferson as president, and the system was changed to count separate electoral votes for the two offices.
Step-by-step explanation:
The Twelfth Amendment of the United States was ratified in the Constitution on June 15, 1804. The amendment was ratified in the Constitution for cases where electoral college votes fail to elect President due to tie in votes.
This amendment was ratified in the Constitution after the 1800 Presidential election, where Thomas Jefferson and Aaron Burr were both given equal votes. There was a tie between Jefferson and Burr, and was, therefore, unable to elect any President. Then the House of Representative chose Jefferson as a President with two-third of Senate votes. The House chose to count separat electoral vote to elect President.
Therefore, option A is correct.