Two polynomials $$f(x)$$ and $$g(x)$$ of degree 3 have $$2x^{2} + 7x + 5$$ as a common factor. If 1 and 2 are respectively the zeros of $$f(x)$$ and $$g(x)$$, then the zeros of the polynomial  $$\left(f(x) - g(x)\right)$$ are

A

both negative

B

both positive

C

of opposite sign

D

zero and five