Corporation a Receives a Dividend from Corporation B

Corporation A receives a dividend from Corporation B. It includes the dividend in gross income for tax purposes but includes a pro-rata portion of B's earnings in its financial accounting income. If A has accounted for the dividend correctly (using the general rule) , how much of B's stock does A own?

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