Doing the same with fewer resources is:

In procurement and operations performance evaluation (often evaluated via the "3 Es" framework: Economy, Efficiency, and Effectiveness), efficiency refers to the relationship between inputs (resources) and outputs. Achieving the same output while using fewer resources (or producing greater output with the same inputs) is the precise definition of operational efficiency.

B. Effectiveness measures the extent to which intended goals or outcomes are achieved ("doing the right things"), irrespective of resource consumption.
C. Economy focuses on minimizing the acquisition cost of input resources while preserving appropriate quality.
D. Option D duplicates Option A; Efficiency is the correct standard term for this input-output operational ratio.

1. CIPS Study Guide: L3M1 Procurement and Supply Environments, Module 1, Section 1.2 "Performance Measurement and the 3 Es".

2. National Audit Office (NAO). (2020). Value for Money Handbook, Section 2 "The 3Es Framework", pp. 6–8.