The Position Vector of a Particle Is R(t) $t = 0$

Multiple Choice

The position vector of a particle is r(t) . Find the requested vector.
-The velocity at $t = 0$ for $\mathbf { r } ( t ) = \cos ( 5 t ) \mathbf { i } + 7 \ln ( t - 2 ) \mathbf { j } - \frac { t ^ { 3 } } { 10 } \mathbf { k }$

A) $\mathbf { v } ( 0 ) = - 5 i - \frac { 7 } { 2 } \mathbf { j }$
B) $v ( 0 ) = 5 i - \frac { 7 } { 2 } j$
C) $\mathbf { v } ( 0 ) = - \frac { 7 } { 2 } \mathrm { j }$
D) $\mathbf { v } ( 0 ) = \frac { 7 } { 2 } \mathbf { j }$