Straited I believe is the answer.
I’m not a hundred percent sure, but off intuition I would say
Check the scene for hazardous conditions
Call EMS with information about the accident.
Check the vital signs of the patient
Administer first aid
Twice as old as" means we will be multiplying by 2. "her cousin" - we need a new variable C to represent her cousin's age. "was three years ago" - 3 years ago means we will have to subtract 3.
I think the answer is C because many teens and adults have unsafe lifestyles that lead to injury and death.