Final answer:
The Fireside Poets did not emphasize bold new themes and poetic forms, instead sticking to traditional forms and focusing on social reform, nature, and the common man.
Step-by-step explanation:
The characteristic that is not a trait of the Fireside Poets is A. An emphasis on bold new themes and poetic forms. The Fireside Poets were known for advocating social reform, appreciating nature, and valuing the common man, reflecting ideals of the Romantic period. Their name comes from their popularity in American homes during the evenings, where families would read their poetry by the fireside. They generally adhered to traditional poetic forms rather than experimenting with new styles; thus, the emphasis on bold new themes and forms does not describe their work accurately.