Final answer:
Anglo American settlers agreed to Mexico's rules to acquire cheap land, which is answer D. Despite this, many kept their religious practices and cultural identity and were discontent with Mexico's abolition of slavery.
Step-by-step explanation:
Anglo American settlers agreed to Mexico's rules, which included becoming Mexican citizens, speaking Spanish, and converting to Catholicism, predominantly because they were enticed by the opportunity to acquire cheap land. These settlers, most of whom were from southern states, viewed the land in Texas as a means to expand their agricultural ventures, particularly cotton farming, with the added benefit of being able to do so with slave labor. The answer to your question is D. wanted cheap land.
However, despite these agreements, many settlers retained their cultural identity, including religious practices. They were predominantly Protestant and viewed the Catholicism requirement as an imposition. In addition, the abolition of slavery by the Mexican government in 1829 caused significant discontent among the settlers, who were accustomed to the institution of slavery and signaled their reluctance to integrate entirely into Mexican society. This stance foreshadowed the growing tensions that would eventually lead to the Texas Revolution.