The Magnitude of the Acceleration of a Particle Moving Along $\mathbf { r } ( t ) = t ^ { 2 } \mathbf { i } - t \mathbf { j } - t ^ { 2 } \mathbf { k }$

Multiple Choice

The magnitude of the acceleration of a particle moving along the curve $\mathbf { r } ( t ) = t ^ { 2 } \mathbf { i } - t \mathbf { j } - t ^ { 2 } \mathbf { k }$ is

A) $2 \sqrt { 2 }$
B) $\sqrt { 11 }$
C) $\sqrt { 8 t ^ { 2 } + 1 }$
D) $\sqrt { 5 }$
E) $\sqrt { 8 t ^ { 2 } - 1 }$