For the Function Represented in the Graph, Determine the Domain $\{ x \mid - 5 \leq x \leq 5 \}$

For the function represented in the graph, determine the domain or range, as requested.
-Find the domain.

A) $\{ x \mid - 5 \leq x \leq 5 \}$
B) $\{ x \mid - 3 \leq x \leq 3 \}$
C) all real numbers
D) $\{ x \mid - 18 \leq x \leq 18 \}$