The correct answer is A
[tex]<b>For the commutative property of addition, it does not matter matter the order, the result is the same.</b>[/tex]
That is.
[tex]a+b=b+a[/tex]
Therefore for the given problem,
[tex]1+12=12+1[/tex]
Any way you add it you get the same result.
That is;
[tex]1+12=13[/tex]
and also
[tex]12+1=13[/tex]
ether you choose yo add 12 to 1 or you choose to add 1 to 12 the value is the same.