Answer:
Explanation:
Let's just get the answer and then show why the others are wrong.
The answer is C.
The number of reactants and Products need not be the same
C3H8 + 5O2 ===> 3CO2 + 4H2O
The reactants = 1 + 5 = 6
The products = 3 + 4 = 7
So A is incorrect.
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B is saying that 
C3H8 + 5O2 ===> C3H8 + 5O2
The answer is obviously not B
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C8H18(l) + O2(g) ==> CO2(g) + H2O(g)      unbalanced
Gasoline is a liquid. All the rest are gases. D is wrong.
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C is correct
The left side has 
3 Cs
8 Hs
and 10 Os
The right side has
3Cs
8Hs
10 Os
 
        
             
        
        
        
Metals are found in group 1, 2, and abit of 3. 
Non-metals are found in group 0/8, abit in 4, 5, 6 and 7 too. Here is a picture. Most of the periodic table are metals.
 
        
             
        
        
        
A young lady of property is a noun.