Find the Term That Should Be Added to the Expression $x^{2}-2 x$

Multiple Choice

Find the term that should be added to the expression to form a perfect square trinomial. Write the resulting perfect square trinomial in factored form.
- $x^{2}-2 x$

A) $1 ;(x+1) ^{2}$
B) $1 ;(x-2) ^{2}$
C) $0 ;(x-1) ^{2}$
D) $1 ;(x-1,) ^{2}$