Dividend to be paid to Preference shareholders in 2014= No of Preference shares*par value per share*Percentage of Shares
=2500*50*4%
=$5000
Dividends declared duing 2014=$3000, Thus Preference share holders need to be paid $2000 , in 2015, as preference shares are cumulative in nature.
Dividend to pe paid to Preference shareholders in 2015= $5000+$2000
=$7000.
Dividend to be paid to common share holders= $18000-$7000
=$11000
Thus B will be the answer.