If there were a fire, explosion, or bomb threats in schools, for example, are required to evacuate but if it's a sniper or shooter then they do a lockdown. Because if the shooter is on the outside and they decide to evacuate then they could get shoot so most schools and places do lockdowns.
So the answer would be a sniper. I hope this helps!
Electricity is the manifestation of traveling currents. These currents however are unable to move unless one were to complete a "circuit" (Word you are looking for). If the circuit is not completed electricity doesn't travel.
Out of A,B and C the answer is A
It's the white blood cells I think
