The correct answer is B) stop the further colonization of Texas by American settlers.
The major goal of the Law of April 6, 1830, was to stop the further colonization of Texas by American settlers.
By 1830, Mexican authorities received reports that Texas was in the plans of the United States for future annexation. This made the Mexican federal government take some actions to prevent any further US decisions on this issue. The reports confirmed that more and more American citizens were crossing to the Texas territory. So the federal government issued the Law of April 6, 1830, to stop the further colonization of Texas by American settlers and prohibited slavery in this territory.