Natural emergency: something that occurs naturally
manmade: something caused by a person (ex.shooting)
Answer:
D.they protect first aiders acting in good faith
Explanation:
Because Good Samaritan laws is a legal injunction that gives legal protection to anybody who give reasonable assistance to those who are or they believe to be, injured, ill, in distress or incapacitated.
63% is all I could find but I hope this helps even though I couldn't find the exact number.