The equations in options B and D are the polynomials other equations are not polynomial.
What is polynomial?
Polynomial is an expression of more than two algebraic terms, especially the sum of several terms that contain different powers of the same variable(s).
The exponent of the polynomial should be always a whole number like {0,1,2,3,4,5,6,.........}
Here in the option, only two equations are polynomials that are
(2/3)x²+x+1 and x³+2x+√2
Hence the equations in options B and D are the polynomials other equations are not polynomial.
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