Reading Comprehension (RC) | Q3 explanation

GmatDM2016

For Q3, C stood out to me the most, while the rest felt a little iffy. Here's what led me to think C is the best answer: "The opening of the Gulf of California because of seismic activity around 6 million years ago enabled a large river to cut its way northeast from the gulf" from P2.


How long did everyone else take to complete this passage - from reading the passage to answering all the questions?
Took me just a little under 8 min... And only got 2/3.
This passage was
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