List the Elements of the Set $A = \{ x \mid x$

Multiple Choice

List the elements of the set.
-If $A = \{ x \mid x$ is an even integer $\}$ and $B = \{ 29,31,33,35 \}$ , list the elements of $A \cup B$ .

A) $\{ 29,31,33,35 \}$
B) $\{ x \mid x$ is an even integer $\}$
C) {}
D) $\{ x \mid x$ is an even integer or $x = 29$ or $x = 31$ or $x = 33$ or $x = 35 \}$