Answer: A) Commutative Property of Addition.
Explanation:
Given: 2 + x + y = x + 2 + y, here 2 and x interchange their position but the sum remains same, this is given by commutative property of addition.
In algebra,commutative property of addition says that it does not matter which number we add firs t. The answer remains the exactly same after changing the order of the digits in addition.
i.e. a+b=b+a for every real numbers a and b.
For example:-
23+14=14+23=37