Final answer:
Option A, Queen Boadicea using a spear to fight, reveals heroic qualities and supports the theme of loyalty to one's country.
Step-by-step explanation:
The detail in the excerpt from The Story of a Warrior Queen that reveals heroic qualities and supports the universal theme of loyalty to one's country is option A. Queen Boadicea uses a spear to fight. This detail shows that Queen Boadicea is brave and willing to engage in combat to protect her country. It also aligns with the theme of loyalty, as she is actively defending her people and their land.