Final answer:
Anne Bradstreet's poem uses 'a burning Sun' as a symbol for her husband, representing his essential and nurturing presence in her life. The correct answer is option: a burning Sun.
Step-by-step explanation:
In Anne Bradstreet's poem "A Letter to my Husband, Absent Upon Public Employment," Anne Bradstreet was a loving and devoted wife; that much is evident from the poems she wrote about her husband in his absence. The symbol for her husband is a burning Sun.
This metaphor illustrates the warmth and light her husband provides in her life, akin to the sun's essential role in the natural world. The symbolism conveys not only his importance to her well-being but also his nurturing presence that sustains her during his absence.