问题如下：
Matt suggests using portfolio stock to generate incremental revenue, thereby partially offsetting the other costs of managing the portfolio but potentially creating undesirable credit and collateral risks. The method that Matt suggests to add incremental revenue is:
选项：
A. investor activism
B. securities lending.
C. attribution analysis.
解释：
B is correct.
考点：Income In An Equity Portfolio
解析: 证券借贷获得的收益通常用于抵消与投资组合管理相关的成本。然而，通过借出股票，投资者将暴露于融券方不能按时归还股票的风险，这种风险包括两个方面：融券方的信信用风险以及与所提供的抵押品的市场风险。
其他两个选项是什么意思？好像没见过啊