Final answer:
The line of poetry "With the dew on his brow and the rust on his mail" is written in anapaestic tetrameter.
Step-by-step explanation:
The question asks us to identify which of the three lines of poetry is written in anapaestic tetrameter. Anapaestic tetrameter is a poetic meter that has four anapaestic feet per line. Each 'foot' in an anapaestic meter is made up of two unstressed syllables followed by a stressed syllable, illustrated as da-da-DUM. Let's analyze each line.
The first line, "I think of thee my thoughts do twine and bud", does not fit the anapaestic pattern as it has a mixture of iambic feet (unstressed-stressed) and possibly anapests but not in a consistent tetrameter pattern.
The second line, "With the dew on his brow and the rust on his mail", follows the anapaestic pattern with each foot starting with two unstressed syllables and ending with a stressed syllable, forming an anapaestic tetrameter.
The third option, "The island man wakes up", is too short to fit an anapaestic tetrameter pattern.
Therefore, the second line is written in anapaestic tetrameter.