Need bad 13 points

one of the easiest ways to protect your family from a fire is to:

a) practice fire escape plans
b) install a smoke detector
c) store flammable materials outside of the home
d) practice using a fire extinguisher

♥ You can cancel out C, storing flammable objects outside your house is very unsafe and should never happen.
♥ Cancel out D, depending on a fire, a fire extinguisher wouldn't clear the fire.
♥ B 
and A are now left, A, yes A can be useful, but also if you were to be sleeping, how would you know the fire started?
♥ Which Is why I would go with B.
♥ B is very safe, and you can here the alarms beeping and immediately know whats going on rather then not knowing there is a fire by sleeping. 

I think the answer should be B because if you get a smoke detector you and your family will know that there is a fire. Fire detectors are Loud so that means that you can hear it from almost anywhere around your house.

Pe.dometer would be the most useful to you for monitoring heart rate.