The Way That the Balanced Scorecard Should Be Adapted as a Tool

The way that the balanced scorecard should be adapted as a tool for monitoring sustainability which is generally considered to be the most useful approach, is:

A) Integrating environmental and social aspects into the four standard perspectives
B) Adding an additional sustainability perspective
C) Developing a separate, individually derived, sustainability scorecard in conjunction with the existing scorecard
D) There is no opinion as to which is the best option