Practice: Expression of Ideas

A student has taken these notes:

• The Great Barrier Reef spans over 1,400 miles along Australia's northeastern coast.
• It is the world's largest coral reef system, comprising over 2,900 individual reefs.
• Rising ocean temperatures have caused severe coral bleaching events in 2016, 2017, and 2020.
• Marine biologists estimate that half the reef's coral cover has been lost since 1995.

The student wants to emphasize the threat to the reef. Which choice most effectively uses relevant information from the notes to accomplish this goal?