Just Before Valentine's Day, the Price of Roses Increases Dramatically

Just before Valentine's Day, the price of roses increases dramatically. This is because

A) self-interested individuals try to charge more for a good than consumers are willing to pay.
B) demand increases while the supply of roses remains relatively constant.
C) the supply curve of roses is highly elastic.
D) the demand for roses is relatively inelastic most of the year, but becomes more elastic as demand increases.