yt770
I still don't understand how "it" is a problem in A as "it" can't refer to baby, but in choice C and E, "its" referring to baby is not a definite error. "Its" referring to baby or womb won't make sense, so that should be enough to eliminate C and E. I understand there are other errors in C and E.
Can "its" referring to "baby" considered okay?
Thanks for your help!
YT
I will be glad to help you out with this one.

Let's take a look at the original sentence:
As a baby emerges from the darkness of the womb with a rudimentary sense of vision, it would be rated about 20/500, or legally blind if it were an adult with such vision.In the structure
it would be rated..., pronoun
it cannot refer to
a baby because this reference does not make logical sense. A baby cannot be rated 20/500. Per the context of the sentence, only the sense of vision can be rated so.
Now, the way the original sentence is written, the antecedent of both the instances of pronoun
it must refer to the same noun entity. However, pronoun
it in the structure
if it were an adult... cannot refer to
the sense of vision because a sense of vision cannot be an adult.
So, in Choice A, usage of pronoun is incorrect because their reference is not logical.
Now let's talk about Choice C and E. IMHO, usage of pronoun
it in Choices C and E are not ambiguous because the sentence won't make sense if
it is deemed to refer to any other noun entity apart from
a baby. But yes, these two choices have other very definite errors and hence, can be rejected easily.
Hope this helps.

Thanks.
Shraddha
Want 1 clarity.
In option D, the sentence after semicolon has the word 'such' in it. Can an independent clause have elements that are actually dependent upon the previous sentence? If the criteria of independent clause is that it should stand alone, does the clause after semicolon in option D qualify to be an IC?
If I just wrote this sentence alone, how would someone know what does 'such' refer to?