怎么解释这道题

问题如下：

As of 2020, the country or region that had the highest proportion of sustainable investing relative to total managed assets was:

选项：

A.Europe.

B.Canada.

C.Australia/New Zealand.

解释：

A. Incorrect because the proportion of sustainable investing relative to total managed assets grew in most regions, and in Canada, responsible investing assets now make up most of the total assets under professional management. The exceptions to this trend are Europe and Australia/New Zealand, where sustainable investing assets have declined relative to total managed assets since 2018.

B. Correct because the proportion of sustainable investing relative to total managed assets grew in most regions, and in Canada, responsible investing assets now make up most of the total assets under professional management.

C. Incorrect because the proportion of sustainable investing relative to total managed assets grew in most regions, and in Canada, responsible investing assets now make up most of the total assets under professional management. The exceptions to this trend are Europe and Australia/New Zealand, where sustainable investing assets have declined relative to total managed assets since 2018.