The data below show the % changes of stock prices compared with the previous month during the past 6 months. Out of three companies, which has the highest ?

Jan. Feb. Mar. Apr. May June

Stock Market 0.8 -0.3 1.2 2.2 -1.1 3.1

Company A 0.6 0.1 0.8 1.1 0.0 2.0

Company B 0.7 -0.2 1.1 1.8 -0.8 2.2

Company C 1.1 -0.4 1.3 2.5 -2.0 4.0

1. Company A
2. Company B
3. Company C

(8) When a company evaluates an investment opportunity by present value method, which item is unnecessary among the following three?

1. Cost of equity
2. Internal rate of return
3. Cost of debt