Fill in the Blanks to Complete the Statement $y = - \sqrt { x + 7 }$

Multiple Choice

Fill in the blanks to complete the statement.
-The graph of $y = - \sqrt { x + 7 }$ can be obtained from the graph of $y = \sqrt { x }$ by shifting horizontally $?$ units to the $?$ and reflecting across the ?-axis.

A) 7 ; right: $x$
B) $7 ;$ left; $x$
C) 7 ; left: $y$
D) $- 7 ;$ left; $x$