Let $f ( x ) = \frac { \sqrt { 3 x + 1 } - 2 } { 1 - x }$

Multiple Choice

Let $f ( x ) = \frac { \sqrt { 3 x + 1 } - 2 } { 1 - x }$ Which of the following is true for $\lim _ { x \rightarrow 1 } f ( x )$ ?

A) $- \frac { 3 } { 4 }$
B) $- \frac { 1 } { 4 }$
C) $\frac { 1 } { 4 }$
D) $\frac { 3 } { 4 }$
E) Does not exist