Do you know this answer?! Accounting question about stocks!?

Question

On January 1, Bluefield Corporation had 800,000 shares of $10 par value common stock outstanding. On March 31 the company declared a 10% stock dividend. Market value of the stock was $15/share. As a result of this event,

Bluefield's Paid-in Capital in Excess of Par Value account increased $400,000.

Bluefield's total stockholders' equity was unaffected.

Bluefield's Retained Earnings account decreased $1,200,000.

All of the above.

Answer 1

I think it is Bluefield's retained earnings account decreased 1,200,000