If the position of a point $s$, is given as a function of angular position, $\theta$, by $s = 10 \sin(2 \theta)$, then acceleration, $a$, is

A. $20 \sin (2 \theta)$
B. $20 \alpha \cos (2 \theta) - 40 (\omega)^2 \sin (2 \theta)$
C. $20 \alpha \cos (2 \theta)$
D. $-40 \alpha \sin (2 \theta)$