*Note: A polynomial is an expression having variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables
and is not a polynomial because it does not contain integer power of the variable “y”
And, is not a polynomial because it contains a negative power of the variable, which is not the criteria for a polynomial.
∴ y is a polynomial as it follows the criteria of polynomial and all the other do not follow these criteria.
Hence, option C is correct
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