Calculate the Arc Length of the Indicated Portion of the Curve

Multiple Choice

Calculate the arc length of the indicated portion of the curve r(t) .
- $$\mathbf { r } ( \mathrm { t } ) = 4 \mathrm { ti } + \left( 6 \cos \frac { 1 } { 2 } \mathrm { t } \right) \mathbf { j } + \left( 6 \sin \frac { 1 } { 2 } \mathrm { t } \right) \mathbf { k } ; - 8 \leq \mathrm { t } \leq 1$$

A) -35
B) 45
C) -175
D) 225