Find the Term That Should Be Added to the Expression $x^{2}-3 x$

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.
- $x^{2}-3 x$

A) $0 ;\left(x-\frac{3}{2}\right) ^{2}$

B) $\frac{9}{4} ;\left(x-\frac{3}{2}\right) ^{2}$

C) $\frac{9}{4} ;\left(x+\frac{3}{2}\right) ^{2}$

D) $9 ;(x-3) ^{2}$