A. Spectators are already claiming their seats hours before the event.
The power of Boadicea is highlighted in this excerpt, using adjectives such as fierce, beautiful, and the imagery of "her golden hair blowing round her in the wind" giving the illusion of someone otherworldly, superior to common beings. Her speech rouses deep passion in the people, it's a call for action that is responded eagerly. Loyalty to the Queen is loyalty to the Country, the soldiers pledge their lives to her, hence they pledge their lives to fight for the country against the Romans. Her rage is mirrored and multiplied, till everybody is willing to die for her, to avenge their country.
The correct answer is 1: Illustration-example.
Illustrations and examples are introduced by the transition phrases such as "for instance" and "for example". Some other linking words for giving examples are "to illustrate", "namely", and "such as". These linking words do not necessarily have to be at the beginning of the sentence.