The first option: Additive Inverse Property is the right answer
Step-by-step explanation:
Additive inverse can be defined as: " For every number x, there exists a number -x, the sum of both is zero"
<u>Additive Inverse Property:</u>
Additive inverse property states that the sum of a number and it's additive inverse is zero
i.e.

In the given proof, the same property is used in the step:
![b+a+(-a) = b+[a+(-a)]\\b+a+(-a) = b+0](https://tex.z-dn.net/?f=b%2Ba%2B%28-a%29%20%3D%20b%2B%5Ba%2B%28-a%29%5D%5C%5Cb%2Ba%2B%28-a%29%20%3D%20b%2B0)
Hence,
The first option: Additive Inverse Property is the right answer
Keywords: Proves, Additive inverse
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