Difficult question. Thanks Gary and the Magoosh Chocolate Factory!
Split1) Grammatical. First "it" is unclear = refers to baby (noun) or visions. A is out.
Split2) the word "or" is confusing. Meaning we want an explanatory word that says the vision of 20/500 is equivalent to blind as an adult. The word "or" is not explanatory. A and B are out.
Split3) After a semicolon (;) and before it, you need to have an independent though => independent; independent =>
...
Split1) Grammatical. First "it" is unclear = refers to baby (noun) or visions. A is out.
Split2) the word "or" is confusing. Meaning we want an explanatory word that says the vision of 20/500 is equivalent to blind as an adult. The word "or" is not explanatory. A and B are out.
Split3) After a semicolon (;) and before it, you need to have an independent though => independent; independent =>
...








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