Which of the following is true of the annexation of Texas?
a. caused an immediate war with Spain and sectional divisivness over land
b. caused war with Mexico and sectional divisivness over Texas' size
c. caused war with the United States and sectionalism over fugitive slaves
d. immediately brought about all the above.
Of the options that you have given here, only B could be considered the right answer. All of the others are clearly wrong.
A cannot possibly be correct. Texas was not annexed by the United States until 1845. By that point, Mexico (to which Texas had belonged) had been independent of Spain for decades. Spain would not have gone to war over the annexation of Texas.
C cannot possibly be correct. It was the United States that annexed Texas. The US would not have gone to war with itself over the issue of Texas. If A and C are both incorrect, then D cannot be correct either.
B is the correct answer. The US and Mexico went to war largely over the issue of the annexation of Texas. Within the US, there was divisiveness between the North and South over the issue of slavery in the large new area that had been brought into the Union.