Big Book RC - Test 4 - Section 4

Hello,
The above question is from Big Book - Test 4, Section 4, Question 18.
When I was reading the passage and simplifying it, I interpreted the first paragraph as a phenomena that occurs - ‘Supernovas burst, create stars and occurs in a spiral structure‘. And the second paragraph as the reasoning for its occurance (Why does it have the spiral structure). Therefore, I selected B.

But while watching greg’s explanantion to this passage, he mentioned that the first paragraph is a new theory and the second paragraph is an old theory. I did not understand that part. The passage does not state or infer that there are two are separate theories.

Can someone please help me understand where I went wrong? and help me in understanding the passage?

You can see they talk about a new theory, and then it talks about “the most widely accepted” theory, right?

Can you please elaborate on it?

Well, a new theory and a widely accepted theory are likely gonna be different theories, right?

Understood that the second passage is a new theory. But what makes the first para as an old theory?
”Hallmark of the most widely accepted theory”, this line, to me, does not make the first para as old theory. Additionally in the first line of second para, it states “This line of reasoning“, does not indicate that its a theory. Or does it?
I am genuinely confused with this passage. Please help me out with clear elaboration.

Nope. The first paragraph describes some reasoning for the new theory. In para 2, it says how this reasoning can form a new theory. Rest of para 2 then talks about the old theory.

It’s like this:

Para 1:

  • Reasoning for Theory 2

Para 2:

  • Introduce theory 2
  • Compare theory 2 to theory 1
  • Details about theory 1

Theory 2 is new, theory 1 is old