In the second paragraph, the two commas in the last sentence serve which of the following purposes?
A
They indicate a hierarchical relationship between the three phrases in the sentence.
B
They create an equivalency between the author’s assertions in the last two clauses and a claim of his opponents in the first clause.
C
They separate three related objections to which the author imagines himself responding.
D
They set off a clause that clarifies an idea introduced in the first clause.
E
They connect the author’s ideas to those of his imagined audience.