Answer:
I believe it is C
Explanation:
Because when they signed it officially made the world aware that they were no longer apart of Britain and they were their own country.
In general, an extended metaphor is "<span> a metaphor that sustains the comparison for several lines, or for an entire poem" since it is almost always longer than a standard metaphor. </span>
<span>the stamp act mandated that all printed material in the colonies be produced on paper from London embossed with a revenue stamp</span>