For any numbers \(m\) and \(n\), let \(m \oplus n\) be defined as \(m \oplus n= m-n+n^{2}\). Which of the following will never be negative?

I. \( a \oplus a\)

II. \((a+b) \oplus b\)

III. \((a+b) \oplus (a+b)\)

(A) I only

(B) II only

(C) I and II only

(D) I and III only

(E) I, II, and III

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