9. What does energy efficiency mean? A. How much useful work we can get from each unit of energy used
B. How fast the energy can be expended
C. The maximum amount of energy an appliance can use
D. The overall energy use that is tracked throughout time

The awnser is A

Explanation:

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answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.