The detail which reveals heroic qualities and supports the universal theme of loyalty to one's country is that A. Queen Boadicea uses a spear to fight.
This is known to be the main idea or meaning a writer expressed in a literary work or text.
Fighting for one's country shows heroic qualities and loyalty which is one of the themes in the excerpt, as this shows thhe Queen taking on a spear and fighting in defence of her country.
Hence, defending one's country is a heroic quality worth of emulation and expressed in the theme of loyalty as is shown as Queen Boadicea uses a spear to fight.
Therefopre the correct answer is option A.
Note that the excerpt was not found online, but the options were found thereby making the question incomplete, hence, a general overview was given to guide the answer.
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The complete question
Which detail in this excerpt reveals heroic qualities and supports the universal theme of loyalty to one's country?
Queen Boadicea uses a spear to fight.
Queen Boadicea's people are filled with love for her.
Queen Boadicea believes in a vengeful god.
Queen Boadicea's golden hair blows around her in the wind.