![\boxed{\underline{\bf \: ANSWER}}](https://img.qammunity.org/2022/formulas/german/high-school/at02zqxy8f9f40873nz40p480ht94oo2fc.png)
Adding -3 is equal to b. subtracting 3.
Take a look at the example (hint) they have given in the question.
![\sf \: 5 + ( - 3) = 2 \\ \sf \: 5 \: \underline{- 3} \: = 2 \\ \sf2 = 2](https://img.qammunity.org/2022/formulas/mathematics/high-school/f95deevpaonhtarch5cxj9h7j8flnq946i.png)
We can see that, when we took + (-3) as - 3, the equation still worked. So, therefore -> Option B. is the correct answer.
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Hope it helps.
RainbowSalt2222