Final answer:
Option B best summarizes the theme of 'Burning a Book,' reflecting the detrimental impact of book burning and censorship on free speech and the dissemination of ideas in society.
Step-by-step explanation:
The theme of William Stafford's poem "Burning a Book" is a nuanced topic that does not conform to a simplistic summary, as each reader may derive different meanings based on their own interpretation. However, when considering the options given, Option B seems to align most closely with the general idea of the poem. This option accentuates the notion that book burning represents a broader metaphor for the suppression of free speech and the deleterious effects of censorship on society's access to knowledge and the diversity of ideas.