How Did Pro-Annexation Democrats Engineer the Annexation of Texas in 1845

How did pro-annexation Democrats engineer the annexation of Texas in 1845?

A) They bribed several major figures in the Mexican government to support annexation.
B) The Democrats promised Whig congressmen that they would fund internal improvements in exchange for Whig votes.
C) They arranged for the measure to come to a vote in the Senate when several anti-annexation senators were absent.
D) The party approved it through a joint resolution,which required only a majority vote in both houses of Congress.