Many population studies have linked a high-salt diet to high rates of hypertension and shown that in societies where they consume little salt, their blood pressure typically does not rise with age.



A. shown that in societies where they consume little salt, their

“Their” blood pressure cannot refer to societies’ blood pressure- Eliminate. 


B. shown that in societies that have consumed little salt, their

Same as A. Eliminate. 


C. shown that in societies where little salt is consumed,

Correct. 

Many population studies have-

  • Linked  a high-salt diet to high rates of hypertension and

  • shown that in societies where little salt is consumed,

blood pressure typically does not rise with age.


Both verbs are parallel. Option  is correct. 


D. showing that in societies where little salt is consumed,

“Showing” is not parallel to “linked” 


E. showing that in societies where they consume little salt, their

“Showing” is not parallel to “linked” 

“Their” blood pressure cannot refer to societies’ blood pressure.  Eliminate.