Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A California mother has opened up about the horrific experience of watching her once-vibrant daughter fade away and die from a little understood brain-eating amoeba. Sybil Meister firmly believes her daughter Koral Reef picked up the deadly and mysterious Balamuthia mandrillaris infection during a family trip to Lake Havasu in May 2013. Reef married her high school sweetheart that July and began to show worsening symptoms like headache, fatigue and stiff neck a couple of months later. By October 2014, Reef would be dead. She was 20-years-old. Tragic: Koral Reef, left, was a blushing bride in July 2013 as she wed her high school sweetheart. The 20-year-old Temecula, California woman would be dead just over a year later from a rare, deadly and incurable brain-eating amoeba infectionKoral Reef, 20, died last year after a horrifying and protracted battle against the little-understood parasite Balamuthia mandrillarisReef was wed to her high school sweetheart in July 2013 just months before she began showing symptoms like headache, fatigue and stiff neckReef's mother Sybil Meister believes Reef picked up the amoeba on a trip to Lake Havasu in May 2013 -- she was dead by October 2014 
 Question:_ has now embarked on a campaign to teach others about the water- and soil-borne infection.

Sybil Meister