问题如下：
The market value of equity for a company can be calculated as enterprise value:
选项：
A. minus market value of debt, preferred stock, and short-term investments.
B. plus market value of debt and preferred stock minus short-term investments.
C. minus market value of debt and preferred stock plus short-term investments.
解释：
C is correct.
Enterprise value is calculated as the market value of equity plus the market value of debt and preferred stock minus short-term investments. Therefore, the market value of equity is enterprise value minus the market value of debt and preferred stock plus short-term investments.
为什么这里要把优先股减去？equity不是包括优先股和普通股？