Find the Largest Open Interval Where the Function Is Changing $f(x)=x^{2}-2 x+1$

Multiple Choice

Find the largest open interval where the function is changing as requested.
-Increasing $f(x) =x^{2}-2 x+1$

A) $(0, \infty)$
B) $(-\infty, 1)$
C) $(1, \infty)$
D) $(-\infty, 0)$