The question is what is at the heart of these paragraphs.
- Signal words are but (line 1), But (line 4), So...that (line 6).
- Answer C mentions procreation, the text does not mention it at all.
- Answer D mentions the maie physique, not at all in the text.
but (line 1) it says that the Y chromosome goes down.
but (line 4) it says that it is not what it once was.
So there is a passage of time, as is also expressed in Answer A