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To determine the missing step using the commutative property, we need to rearrange the terms in the expression, which states that the order of addition does not affect the sum.
**Step 1:**
12a + 10 + a = 10 + 12a + a
The expression can also be rearranged as \(10 + a + 12a\) (keeping \(10\) and \(a\) first).
Thus, the complete proof would be:
**Step 1:** 12a + 10 + a = 10 + 12a + a
**Step 2:** 10 + 13a = 10 + 13a
**Step 3:** The expressions are equivalent because they both equal the same value.
To clarify the options you provided, the correct missing step is:
**12a + 10 + a = 10 + 12a + a.**