NO.PZ2024010508000030
问题如下：
An ESG integration approach that focuses on more concentrated holdings of fewer securities is best described as:
选项：
A.a discretionary strategy.
B.an index-based strategy.
C.a quantitative multi-factor strategy.
解释：
A is correct. Discretionary strategies focus on depth in a portfolio, manifested as fewer, more concentrated holdings. Quantitative and index-based strategies focus on breadth and use a much larger portfolio of holdings.能否解释一下题目意思
