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Which sentence from the passage best supports the answer that Pecos Pueblo became a trading center is the first event in the history of Pecos Pueblo?
a. "The next year he came back with a wagon train full of goods."
b. "Around A.D. 800, many tribes came to trade, and they brought items such as buffalo hides, shells, pottery, and food."
c. "Their idea worked, because the Spanish left to search for the lost city of gold."
d. "While the Spanish were in control, they built a great church."
b. "Around A.D. 800, many tribes came to trade, and they brought items such as buffalo hides, shells, pottery, and food."