Express the Indicated Roots of Unity in Standard Form a $1+0 \mathrm{i}$

Multiple Choice

Express the indicated roots of unity in standard form a + bi.
-Tenth roots of unity

A) $1+0 \mathrm{i}$
$$\begin{array}{l}\cos \frac{\pi}{5}+i \sin \frac{\pi}{5} \approx 0.81+0.59 i \\\cos \frac{2 \pi}{5}+i \sin \frac{2 \pi}{5} \approx 0.31+0.95 i \\\cos \frac{3 \pi}{5}+i \sin \frac{3 \pi}{5} \approx-0.31+0.95 i \\\cos \frac{4 \pi}{5}+i \sin \frac{4 \pi}{5} \approx-0.81+0.59 i \\\cos \pi+i \sin \pi=-1+0 i \\\cos \frac{6 \pi}{5}+i \sin \frac{6 \pi}{5} \approx-0.81-0.59 i \\\cos \frac{7 \pi}{5}+i \sin \frac{7 \pi}{5} \approx-0.31-0.95 i \\\cos \frac{8 \pi}{5}+i \sin \frac{8 \pi}{5} \approx 0.31-0.95 i \\\cos \frac{9 \pi}{5}+i \sin \frac{9 \pi}{5} \approx 0.81-0.59 i\end{array}$$
B) $1+0 i$
$\cos \frac{\pi}{5}+i \sin \frac{\pi}{5} \approx 0.81+0.59 i$
$\cos \frac{2 \pi}{5}+i \sin \frac{2 \pi}{5} \approx 0.31+0.95 i$
$0+i$
$\cos \frac{4 \pi}{5}+i \sin \frac{4 \pi}{5} \approx-0.81+0.59 i$
$\cos \pi+i \sin \pi=-1+0 i$
$\cos \frac{6 \pi}{5}+i \sin \frac{6 \pi}{5} \approx-0.81-0.59 i$
$\cos \frac{7 \pi}{5}+i \sin \frac{7 \pi}{5} \approx-0.31-0.95 i$
$\cos \frac{8 \pi}{5}+i \sin \frac{8 \pi}{5} \approx 0.31-0.95 i$
$0-i$
C) $1+0 i$
$$\begin{array}{l}\cos \frac{\pi}{10}+i \sin \frac{\pi}{10} \approx 0.95+0.31 i \\\cos \frac{\pi}{5}+i \sin \frac{\pi}{5} \approx 0.81+0.59 i \\\cos \frac{3 \pi}{10}+i \sin \frac{3 \pi}{10} \approx 0.59+0.81 i \\\cos \frac{2 \pi}{5}+i \sin \frac{2 \pi}{5} \approx 0.31+0.95 i \\\cos \frac{\pi}{2}+i \sin \frac{\pi}{2}=0+i \\\cos \frac{3 \pi}{5}+i \sin \frac{3 \pi}{5} \approx-0.31+0.95 i \\\cos \frac{7 \pi}{10}+i \sin \frac{7 \pi}{10} \approx-0.59+0.81 i \\\cos \frac{4 \pi}{5}+i \sin \frac{4 \pi}{5} \approx-0.81+0.59 i \\\cos \frac{9 \pi}{10}+i \sin \frac{9 \pi}{10} \approx-0.95+0.31 i\end{array}$$
D) $1+0 i$
$\cos \frac{\pi}{5}+i \sin \frac{\pi}{5} \approx 0.81+0.59 i$
$\cos \frac{2 \pi}{5}+i \sin \frac{2 \pi}{5} \approx 0.31+0.95 i$
$\cos \frac{3 \pi}{5}+i \sin \frac{3 \pi}{5} \approx-0.31+0.95 i$
$\cos \frac{4 \pi}{5}+i \sin \frac{4 \pi}{5} \approx-0.81+0.59 i$
$\cos \pi+i \sin \pi=-1+0 i$
$\cos \frac{6 \pi}{5}+i \sin \frac{6 \pi}{5} \approx-0.81-0.59 i$
$\cos \frac{7 \pi}{5}+i \sin \frac{7 \pi}{5} \approx-0.31-0.95 i$
$\cos \frac{8 \pi}{5}+i \sin \frac{8 \pi}{5} \approx 0.31-0.95 i$
$0-i$