I think A. They were determined to make their invention work properly.
The first mask was made in 7000 BC. It was used primarily for rituals and ceremonies and where typically made of leather or wood. Keep in mind, these where the first masks that our modern generation has been able to find and preserve, masks could have been made earlier than this but detirriorated over time.
However, the first modern surgical masks where made in the early 1960s and replaced a more primitive method of cloth masks.
I hope I have helped! :)
Answer: Black codes and Jim Crow laws were laws passed at different periods in the southern United States to enforce racial segregation and curtail the power of black voters. After the Civil War ended in 1865, some states passed black codes that severely limited the rights of black people, many of whom had been enslaved
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b) more complex goods would be more available because they could be made more quickly
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