Refer to the Following Graphs to Determine an Appropriate Response $y = [ [ x ] ]$

Multiple Choice

Refer to the following graphs to determine an appropriate response.
-Which one is the graph of $y = [ [ x ] ]$ ? What is the value of $y$ when $x = 1.5$ ?

A) graph B; $2.25$
B) graph D; 1
C) graph $C ; 1$
D) graph A; $2.25$