List the Elements of the Set $A = \{ 19,21,22,23,26 \}$

Multiple Choice

List the elements of the set.
-If $A = \{ 19,21,22,23,26 \}$ and $B = \{ 19,21,22,23 \}$ , list the elements of $A \cup B$ .

A) $\{ 26 \}$
B) $\{ 19,21,22,23 \}$
C) { }
D) $\{ 19,21,22,23,26 \}$