Stefan wants to add (3 5/7 + 1 1/5 ) + 2 1/7 . He uses the Commutative Property to rewrite the problem. Which shows this step?
A.(3 5/7 + 1 1/5 + 2 1/7 )
B.3 5/7 + (1 1/5 + 2 1/7 )
C.(1 1/5 + 3 5/7 ) + 2 1/7
D.(2 1/7 + 1 1/5 ) + 3/5
commutative: a+b = b+a
so which choice fits that pattern?