Answer: D. Mexican officials wanted to settle areas closest to the United States
Step-by-step explanation:
From the map it is shown that the areas where most successful land grants were located were close to the United States as opposed to Mexico with the North East and the East (which bordered the United States) being given out settlers but the West and the South remaining in free of land grants.
This may have been done for security reasons but regardless of the reason, it backfired because the allowance of settlements to develop so close to the US made it easier for the Texas to rebel against Mexico.