A,C and D
Explanation:
Option A,C and D are not polynomials.
Explanation:
Polynomial functions are given by
 p(x) = a₀ + a₁x¹+ a₂x²+ ...........+aₙxⁿ
 Where a₀, a₁, a₂, ..., an are constant coefficients and n is non negative integer.
Option A
 
 Here one exponent of x is -2, so this is not a polynomial function.
Option B
 
 Here all the exponents are non negative integer, so this is a polynomial.
Option C
 
 Here one exponent of x is 0.5, so this is not a polynomial function.
Option D
 p(x)= x⁻²+x+1
 Here one exponent of x is -2, so this is not a polynomial function.
Option E
 
 Here all the exponents are non negative integer, so this is a polynomial.
Option A,C and D are not polynomials.