Which is an odd monomial function? a. y=2x^3 b.1/x c.5x^-9 d.3

First let's review two concepts:
 Monomy: Algebraic expression that consists of a single term or in which the terms that form it are related by the product operation.
 Odd function: A function is odd if, for each x in the domain of f, f (- x) = - f (x).
 The function y = 2x ^ 3 complies with both definitions.
 
 an odd monomial function is:
 A.y = 2x ^ 3