The blue whale was thriving in all of the world s oceans until the turn of the century, at which time they became hunted to the point of extinction.

• A. The blue whale was thriving in all of the world s oceans up until the turn of the century
• B. At the turn of the century, blue whales were thriving in all of the world s oceans.
• C. Blue whales were thriving in all of the world s oceans until the turn of the century
• D. No Improvement