Presidents Andrew Jackson and Martin Van Buren Rejected Adding Texas

Presidents Andrew Jackson and Martin Van Buren rejected adding Texas to the United States because:

A) the Texas Republic's congress opposed joining the United States, preferring to stay independent.
B) the Mexican army's resounding victory at the Alamo made them fearful of antagonizing a powerful government.
C) the population of Texas was too small to justify it.
D) the presence of slaves there would reignite the issue of slavery, and they preferred to avoid it.