知识点？

问题如下：

Which of the following statements about ESG indices is most accurate? ESG scores used for weightings tilts:

选项：

A.must be data-based only.

B.must be ratings-based only.

C.can be either data-based or ratings-based.

解释：

C. Correct because these ETFs follow the underlying index or basket construction in a rules-based fashion. These can be thematic, namely investing only in certain sectors, or tilt weightings based on ESG scores, as described earlier. These scores maybe be data-based (for example, carbon emissions) or ratings-based (for example, on a provider’s ratings), or a mix of the two. There continue to be debates as to how well these ETFs capture potential ESG factors.