As a result of increased navajo rug sales, what happened to rug production?
a.
the rugs were made out of cotton.
b.
older styles were again produced for trade.
c.
the market became flooded and stopped within 10 years.
d.
modern styles became popular.

I think the older styles were again produced for trade

 The correct answer is :  b. Older styles were again produced for trade.

Explanation:   In the Revival period the Navajo carpet business re-emerged. The Lipponcotts and Cousins of Wide Ruins in 1939 developed new vegetable dyes to be used in the elaboration of carpets. They were woven in classic stylized designs without borders, these designs were adapted to the style of many interiors of the United States as the country was recovering its economy Navajo carpets had a great success.

this isn't a question and if you're going to list things be kind and use commas.