The correct answer is A) land grants from the Mexican government.
What MOST directly caused the total population change in Texas between 1790 and 1830 was land grants from the Mexican government.
After the Independence of Mexico, Spain also left the territories of Texas. Indeed the Mexican new government of Agustin de Iturbide allowed the formation of the state of Coahuila-Texas, and people started to move to this isolated region of the country. Then, the government of Mexico enacted legislation that allowed people to claim a portion of land in Texas. It was the General Colonization Law, that granted the head of a family to settle in Texas. Mexico wanted to occupy the territory and limit the invasion or raids from Native American Indians.
