Answer: Option 'c' is correct.
Explanation:
Since we know that "Polynomials contains one or terms but powers of term must not be in rational numbers or in negative forms".
So, According to options,
A. 5x⁵ is a polynomial.
B. 8x¹⁰+2x⁵ is a polynomial.
C. 5x⁻¹+4x⁻² is not a polynomial because it contains negative powers.
D. x⁵+2 is a polynomial.
Hence, option 'c' is correct.