Answer:
D-It created a less rigid social class system.
Explanation:
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Number 1 is B and number 2 is A and number 3 is C and number 4 is A.
Another word to describe regular series of actions is "process".
Process - a series of actions or steps taken in order to achieve a particular end.
Some examples of processes are: manufacturing – a product assembly process, finance – an invoicing process, a risk management process.
The estimate number is 12.68 million