Pronoun ambiguity is a tricky subject on the GMAT. Here's a couple articles I wrote about it that should cover some of what you're wondering about here:
https://www.manhattanprep.com/gmat/blog ... -the-gmat/
https://www.manhattanprep.com/gmat/blog
...
https://www.manhattanprep.com/gmat/blog ... -the-gmat/
https://www.manhattanprep.com/gmat/blog
...





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