Answer:
b. Brazoria; Dallas
Step-by-step explanation:
Considering the year 1860 in which there was a census and was conducted with a map showing the percentage of slaves in different areas of Texas.
The information revealed Brazoria with over 80% of the slaves made up the population while Wharton came a close second. And given that Dallas has about 12% of the population as slaves, while Nacogdoches; has about 28% of slaves in comparison to the total population.