Corporation a Receives a Dividend from Corporation B

Corporation A receives a dividend from Corporation B. Corporation A includes the dividend in its gross income for tax and financial accounting purposes (no book-tax difference) . If A has accounted for the dividend correctly (following the general rule) , how much of B stock does A own?

A) A owns less than 20 percent of the stock of B.
B) A owns at least 20 but not more than 50 percent of the stock of B.
C) A owns more than 50 percent of the stock of B.
D) Cannot be determined.