Here are the answers to the trivia quiz.

1. C, 1 billion. Valentine's Day is the second largest seasonal holiday for sending cards behind Christmas.

2. B, 25 percent

3. A, Lupercalia. This is a fertility celebration that was commemorated annually on Feb. 15.

4. C, Venus, the goddess of love.

5. A, 1537

6. C, Hamlet. "To-morrow is Saint Valentine's day, All in the morning betime, And I a maid at your window, To be your Valentine."

7. D, The Empire State Building

8. B, hard-boiled egg

9. C, 69 percent, according to the Ipsos-Insight for the American Floral Endowment's Consumer Tracking Study (2004)

10. A, the diamond industry