Which of the following is a monomial?

A monomial is defined as a polynomial that consists of only one term. This means it can take the form of a single variable, a constant, or a product of constants and variables raised to whole number exponents. Unlike polynomials with multiple terms, such as those with two, three, or more terms, a monomial is fundamentally simple, embodying the idea of a single, cohesive mathematical expression.

For instance, (3x^2) is a monomial because it has one term that combines a coefficient (3) and a variable raised to an exponent (2). Choices that describe polynomials with three, two, or four terms encompass more complex structures, which Deviate from the essential characteristic of a monomial being singular in composition. Thus, the option that identifies a polynomial with one term accurately characterizes a monomial.