What event directly sparked the Boston Massacre?

What event directly sparked the Boston Massacre?

A. A crowd of sailors dared British troops to shoot them.
B. An American colonist stuck a British soldier standing guard with an object.
C. An African American sailor shot and wounded a British soldier.
D. Colonists spread negative propaganda about British troops.

Correct answer is option B. An American colonist stuck a British soldier standing guard with an object.