An investor who owns $30\%$ of the common stock of an investee is most likely to exercise significant influence requiring use of the equity method when:

a$.$ The investor and investee sign an agreement under which the investor surrenders significant rights

b$.$ The investor tries and fails to obtain representation on the investee's board of directors

c$.$ The investor tries and fails to obtain financial information from the investee

d$.$ The second largest investor owns only $1\%$ of the investee's outstanding stock