Why Did Americans in the Early 1840s Fear the Continued

Why did Americans in the early 1840s fear the continued existence of Texas as an independent republic?

A) They were concerned that Mexico would reclaim its lost territory and go on to threaten the American South.
B) They worried that Spain would try to regain a foothold in North America through a takeover of Texas.
C) It was a potential refuge for runaway slaves and Indian warriors who might plot against the U.S.
D) It was the object of various British and French schemes that threatened American interests and could lead to war.
E) They did not want a rival republic competing for the loyalties of Latin American nations.