Answer:
Hi!
The answer to your question would be option A. She was able to charge more and demand increased.
Step-by-step explanation:
As we remember, the pottery turned black when it became covered with manure and oxygen was reduced. Because this was unusual, Maria was able to tell the trader that the black pottery was special, and since people tend to pay more for unsual objects or objects that are considered of "one of a kind", Maria was able to increase the price.