Volume of each one is:
- $V_{\text{cuboid}} = l*b*h = 10 * 8 * 6 = 480\ cm^2$
- $V_{\text{cube}} = a^3 = 8^3 = 512\ cm^2$
- $V_{\text{cylinder}} = \pi r^2h \approx 1077.57\ cm^2$
- $V_{\text{sphere}} = \frac{4}{3} \pi r^3 \approx 1436.76\ cm^2$
So, the descending order is:
(D) (iv), (iii), (ii), (i)