Reading Comprehension (RC) | Eating fish and other foods rich in omega-3 fatty acids could help peo

A) Improve memory and retention

The passage didn't talk anything about improving memory. The passage talks about retention but it specifies retention of gray matter volume.INCORRECT

B) Increase gray matter volume that leads to improved analytical skills

The passage doesn't talk about increasing gray matter volume. It talks only about retention of gray matter volume.
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