ACME Corporation used to produce $50 worth of goods (in year 2000 dollars) per million BTUs used.Now it produces $60 worth of goods (in year 2000 dollars) per million BTUs.Based on this,we can conclude:

A) nothing about ACME's energy efficiency.
B) that ACME's energy efficiency has declined.
C) that ACME's energy efficiency has improved.
D) that ACME is using a single energy source and achieving economies of scale in production.

Million BTUs

Million British Thermal Units (BTUs) is a unit of energy measurement, equivalent to the amount of energy needed to heat or cool one million pounds of water by one degree Fahrenheit.

Energy Efficiency

The use of technology or practices that reduce the amount of energy required to provide products and services.

ACME Corporation

A fictional company often used as a generic example in discussions or illustrations of business concepts.