Answer:
Correct option is part 'a' superposition.
Explanation:
Sedimentary rocks are formed when sediments are compressed under their own weight for a large period of time. Hence the layers that settle initially become the bottom layer's and hence are older than the layer's that are on the top.
The Federal Reserve's reserve requirement is 10%, which means that Bank XYZ must keep at least $40 million in an account at a Federal Reserve bank and may not use that cash for lending or any other purpose. The Federal Reserve is the central bank of the United States. It is a bank for banks.
https://investinganswers.com/financial-dictionary/economics/reserve-requirements-5131