The Texas annexation treaty presented by President John Tyler to the U

The Texas annexation treaty presented by President John Tyler to the U.S. Senate in 1844 failed to win Senate ratification because

A) the overwhelming opposition in the U.S. Senate by northern Whigs and northern Democrats to extending slavery to such a large would-be state.
B) Henry Clay’s support for the treaty could not overcome the belief of many skeptical southern Whigs that the linking of Texas and slavery by Tyler and his secretary of state, John Calhoun, was just a political gimmick to advance their political ambitions.
C) the political leaders of the independent Texas republic expressed public misgivings about annexation by the United States.
D) the strong opposition of the Mexican government to the Texas annexation treaty.

ANSWER
Answer: A