$$\text { Find the value of } d ^ { 2 } y / d x ^ { 2 } \text { at the point defined by the given value of } t \text {. }$$

Multiple Choice

$$\text { Find the value of } d ^ { 2 } y / d x ^ { 2 } \text { at the point defined by the given value of } t \text {. }$$
- $$x = t + \cos t , y = 2 - \sin t , t = \frac { \pi } { 6 }$$

A) $- 2$
B) $- 4$
C) $- \sqrt { 3 }$
D) $\frac { 1 } { 4 }$