The passage is about code-switching among Puerto-Rican Americans living in the United States.
question 9 "The primary function of the third paragraph of the passage is to"
I eliminated all answer choices except A and C.
I chose A ("consider a general explanation for the phenomenon of code-switching that is different from the one discussed in the preceding paragraphs.")
The correct answer is C ("show that there are instances of code-switching that are not explained by the factors discussed in the previous paragraph.")
I understand why C is correct, but I can't discern why A is wrong. My support for answer A comes in lines 8-10 when the author says "in the vast majority of cases subtle factors, either situational or rhetorical, explain the use of code-switching."
Since the second paragraph deals with situational reasons for code-switching and the third paragraph discusses rhetorical reasons, wouldn't this make A correct?
What language am I missing in answer choice A that makes it incorrect (or less correct than C)?