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**Hint**: Now the additive inverse of any number is the negative of that number. Hence additive inverse of +a where a is any number is equal to –a. Similarly additive inverse of –a where a is any number is +a.

**:**

__Complete step-by-step answer__Now let us try to understand what additive inverse is. Before understanding additive inverse we should know what is additive identity. Additive identity is a number which upon adding to any number will give the same number.

i.e. a + additive identity = a, where a is any number.

Now for every real number additive identity is 0 since for any real number a, a + 0 = a.

Now additive inverse of any number is a number which upon adding to the number gives additive identity.

i.e. a + additive inverse of a = additive identity.

Now we know the additive identity is 0.

Hence, a + additive inverse of a = 0.

Hence, additive inverse of a = - a.

Hence, we can say the additive inverse of any number is negative of that number.

Hence, the additive inverse of 10 is – 10.

**So, the correct answer is “Option B”.**

**Note**: We should not get confused in Multiplicative inverse and additive inverse.

Additive inverse and Multiplicative inverse are two different concepts. Additive identity is 0 since a + 0 = a, while multiplicative identity is 1. Since $ a\times 1=a $

Similarly additive inverse of a is –a since a + (-a) = 0, whereas multiplicative inverse of a is $ \dfrac{1}{a} $ as $ a\times \dfrac{1}{a}=1 $ .

Also note the difference between identity and inverse.

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