Lines 1 through 12 contribute to the poem by showing imagery that helps the reader understand the urgency of the situation, as shown in option F.
We can arrive at this answer because:
Imagery allows the reader's senses to be heightened and he or she to feel what is being described in the poem. This is highlighted in the lines:
"Sound of a horseman riding hard
Clatter of hoofs in the manor yard
Feet on the steps and a knock resounding
As a fist struck wood with a mighty pounding."
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