ESG indices are best characterized by:

The Official Training Manual cautions that short sample periods limit robust conclusions for ESG index back-tests: “Although the short times (August 2009 to April 2016) limit the ability to make a strong performance claim across multiple economic cycles….” This highlights thedifficulty of back-testing performance across multiple market cyclesrather than implying a standardized methodology across ESG indices.

The manual also shows a widerange of ESG index methodologies(e.g., FTSE Russell, S&P/DJSI) rather than a single standard, further contradicting option A.