The following is NOT useful in an emergency kit An air freshener. Thus the correct answer is C.
What is an emergency kit?
Any situation which cannot be predicted and rise immediately requires sudden actions refer as an emergency. The materials or kits utilized during this time are known as Emergency Kit.
During an emergency a blanket can be used to protect from cold or fire, a portable charger is utilized to charge the phone to maintain connectivity, and emergency numbers are important to seek help from someone.
Therefore, option C as an air freshener is appropriate.
Learn more about emergencies, here:
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