Find the Largest Open Interval Where the Function Is Changing $y=\frac{1}{x^{2}}+7$

Multiple Choice

Find the largest open interval where the function is changing as requested.
-Decreasing $y=\frac{1}{x^{2}}+7$

A) $(7, \infty)$
B) $(-7,7)$
C) $(0, \infty)$
D) $(-7,0)$