Evaluate the Function $\left( \frac { 1 } { 2 } \right)$

Multiple Choice

Evaluate the function.
-Find $\left( \frac { 1 } { 2 } \right)$ when $f ( x ) = 3 x ^ { 2 } + 4 x - 1$

A) $- \frac { 7 } { 4 }$
B) $- \frac { 3 } { 2 }$
C) $\frac { 3 } { 2 }$
D) $\frac { 7 } { 4 }$