Answer:
Option C is the answer.
Step-by-step explanation:
Cumulative property of addition is represented as
(a+b) + c = a + ( b+c)
means numbers can be added in any order by which we get the same answer
Now in this question
(2+7) + 12 = 2 + ( 7 + 12 ) will also show the cumulative property of addition.
Option C is the answer.
