Answer:
A. Addition Property of Equality
Step-by-step explanation:
If a=6, then a+3=9
It means that (a) will become 6.
then (a+3) will become (6+3).
After that, you will add (6+3).
Then the answer is (9) and that
what makes the answer (A. Addition Property of Equality)
as the operation will be an Addition.
Hope This Helps!
