Given That $s _ { x } ^ { 2 }$

Given that $s _ { x } ^ { 2 }$ = 500, $s _ { y } ^ { 2 }$ = 750, $s _ { x y }$ = 100 and n = 6, the standard error of estimate is:

A) 12.247.
B) 24.933.
C) 30.2076.
D) 11.180.