Final answer:
The correct answer is option d) Romanticism.
Step-by-step explanation:
Nonfiction prose during the era when Romanticism was popular often reflected a vigorous sense of nationalism. Romanticism was an artistic and literary movement that glorified not only nature and the historical past but also kindled the flame of nationalism. By emphasizing the folk traditions and the 'true' spirit of the people, Romanticism inadvertently sowed the seeds of nationalism.
Romanticism is best understood through its key characteristics, one of which includes its promotion of national identity. This identity was often formed on the basis of common language, culture, and shared history. The preservation of folk traditions and the reverence of nature were parts of this movement that emphasized the unique qualities of a nation and its people.