Find the Elasticity N of the Demand Function $D ( p ) = \frac { 3 } { 1 + 2 p ^ { 2 } }$

Multiple Choice

Find the elasticity n of the demand function $D ( p ) = \frac { 3 } { 1 + 2 p ^ { 2 } }$ .

A) $n = - \frac { 6 } { 1 + 2 p ^ { 2 } }$
B) $n = - \frac { 4 p ^ { 2 } } { 1 + 2 p ^ { 2 } }$
C) n = 4p
D) $n = - 4 p ^ { 3 }$