问题如下：
Which form of collaborative engagement is most likely to require greater formality in approach?
选项：
A.Group meetings with the company
B.Collaborative letter-writing campaigns
C.Soliciting broader support for a shareholder resolution
解释：
An Investor Forum white paper rated 12 forms of engagement in terms of the need for formality in approach Of the three options listed, direct engagement between groups of investors and the company was considered most likely to require an organized, formal approach and clear engagement objectives
