Which of the following describes a unity in fractions?

A fraction that describes a unity is one that equals one whole. This means that the numerator and denominator of the fraction are equal, resulting in a value of 1. For example, the fraction 4/4 or 5/5 both simplify to 1, representing a complete whole.

Other options might describe various properties of fractions but do not focus on the concept of unity. A fraction greater than one, for instance, indicates amounts larger than a whole, while a fraction with a numerator less than the denominator reasons a value less than one. Lastly, the idea of a number without a decimal point pertains more to the representation of numbers rather than their relationship as fractions. Thus, the defining characteristic of unity in fractions is that it equals one whole.