‘Efficiency is measured in terms of a quantity of …’

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‘Efficiency is measured in terms of a quantity of …’
A . Output per unit of input resource
B . Resource per unit of input
C . Input per unit of output resource
D . Throughput

Answer: C

Explanation:

Output per unit of input resource.

Efficiency is, in a sense, seeking to get as much out of a system, while putting in as little as possible.