可以翻译并解释一下题目吗

问题如下：

The efficiency of shareholder engagement depends on:

选项：

A.

the amount of security in free float.

B.

the length of ownership of shareholders.

C.

whether divestment is known to be a possible sanction.

解释：

C is correct. Shareholder engagement is used by investors to influence a corporation’s decisions on ESG matters. Its efficiency depends on such factors as ownership levels and the threat of divestment, not the amount of security in free float.