Write the Expression in the Standard Form a + Bi $\frac { 2 i } { 1 - i }$

Multiple Choice

Write the expression in the standard form a + bi.
- $\frac { 2 i } { 1 - i }$

A) $- 1 - i$
B) $- 1 + 2 i$
C) $- 1 + i$
D) $1 + i$