#1**+2 **

The vertex of this parabola is at the origin = (0,0)

f(x) = (x - 1)^2 has a vertex of (1, 0)....so "A" is not correct

f(x) = x^2 + 1 has a vertex of (0, 1).....so "B" is not correct

f(x) = x - 1 is the graph of a line.....so....."D" isn't correct, either

So....by default...."C" must be correct

Verify this for yourself here, RP :

https://www.desmos.com/calculator/vgibuvxuhw

CPhill Mar 22, 2018