Half a League is a foot with a stressed syllable followed by two unstressed syllables, i.e., option D.
A three-syllable metrical pattern involved in poetry that starts with a stressed syllable and terminates with two unstressed syllables.
An anapest is a metrical foot that comprised of two unstressed syllables followed by a stressed syllable.
According to the excerpt, half a League is a foot with a stressed syllable followed by two unstressed syllables.
Thus, the correct option is D.
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