Answer: D. Carson’s use of rhetorical questions supports her urgent and knowledgeable tone
Step-by-step explanation:
What is a rhetorical question? A rhetorical question is "a question asked in order to create a dramatic effect or to make a point rather than to get an answer" (Oxford Languages).
We see a rhetorical question being used with the sentence "Can anyone believe it is possible to lay down such a barrage of poisons on the surface of the earth without making it unfit for all life?"
This shows her urgent and knowledgeable tone because she is asking, it is not meek or uncertain. This leads us to answer choice d.