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1 C₈H₂₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Explanation:

When balancing chemical equations, looking for the compound that looks the hardest and put a 1 in front of it.

In this case, it would be C₈H₂₀. Put a 1 in front of it.

Now, let's look at the reactants.

C - 8

H - 20

O - 2

Let's look at the products.

C - 1

O - 3

H - 2

To balance the carbons, put 8 in front of CO₂. To balance the hydrogens, put 10 in front of H₂O.

Now to balance the oxygens. There are 16 oxygen atoms in CO₂ and 10 oxygen atoms in  H₂O for a total of 26 oxygen atoms in the products.

To balance the oxygens, put 13 in front of O₂ in the reactants.

The equation is balanced.

Hope that helps.

the answer would be a