Write the Set Using Set-Builder Notation $\{18,19,20,21\}$ A) $\{x \mid x$ Is an Integer Less Than 22

Multiple Choice

Write the set using set-builder notation.
- $\{18,19,20,21\}$

A) $\{x \mid x$ is an integer less than 22 $\}$
B) $\{x \mid x$ is a natural number between 18 and 21 $\}$
C) $\{x \mid x$ is a natural number between 17 and 22 $\}$
D) $\{18,19,20,21\}$