Answer:
5 km = 3.107 miles
one Kilometer is equal to 0.621371 meters 
so the equation is 
5 km times 0.621371 m
is equal to 3.107
 
        
             
        
        
        
I believe the answer is C because the first two are mechanical hazards and C mentions plug which is electrical.
        
             
        
        
        
Answer:
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Explanation:
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Answer:
only chlorine can expand its octet.
Explanation:
An atom can expand its octet is it has empty d orbital
the electronic configuration of given elements will be:
B : 1s2 2s2 2p1 [Valence shell n =2 no d orbital]
O :1s2 2s2 2p4 [Valence shell n =2 no d orbital]
F : 1s2 2s2 2p5 [Valence shell n =2 no d orbital]
Cl :1s2 2s2 2p6 3s2 3p5 3d0 [Valence shell n =2 no d orbital]
Out of given elements only chlorine has empty d orbitals in its valence shell
Thus only chlorine can expand its octet.
 
        
             
        
        
        
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