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Bunuel
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Bunuel
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I would prefer A or D. I don’t think that pronoun “their” can refer to humans since the word humans is at very beginning of sentence.

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Just an addition.
"as a result of drinking IT"

IMO the pronoun IT does not have any pronoun ambiguity.
Enzyme lactase is not something one can drink. [it's produced inside the body - perhaps the cat will have to cut open itself and drink it's own enzyme!)
The pronoun "IT" has only one clear antecedent i.e "MILK".

Any thoughts?
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C. milk, such cats become sick, as evidenced by those cats’ vomiting or excreting diarrhea or gas.

Option C is incorrect for two reasons.
1. It is excessively wordy.
2. The use of possessive(')+v-ing is not proper in GMAT SC.
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Chandan5793
Just an addition.
"as a result of drinking IT"

IMO the pronoun IT does not have any pronoun ambiguity.
Enzyme lactase is not something one can drink. [it's produced inside the body - perhaps the cat will have to cut open itself and drink it's own enzyme!)
The pronoun "IT" has only one clear antecedent i.e "MILK".

Any thoughts?

Agreed. There is no confusion which antecedent IT refers to.
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Ranasaymon
C. milk, such cats become sick, as evidenced by those cats’ vomiting or excreting diarrhea or gas.

Option C is incorrect for two reasons.
1. It is excessively wordy.
2. The use of possessive(')+v-ing is not proper in GMAT SC.

I didn't know this. Is this confirmed?
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Rainman91
Ranasaymon
C. milk, such cats become sick, as evidenced by those cats’ vomiting or excreting diarrhea or gas.

Option C is incorrect for two reasons.
1. It is excessively wordy.
2. The use of possessive(')+v-ing is not proper in GMAT SC.

I didn't know this. Is this confirmed?

Hello Rainman91,

We hope this finds you well.

To answer your query, such usage is technically correct on the GMAT, but it is considered very redundant and awkward and is thus unlikely to be used in a correct answer choice.

We hope this helps.
All the best!
Experts' Global Team
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