6. A cube is cut by a plane, and the three-view drawing of the remaining part is shown on the right. The ratio of the volume of the cut-off part to the volume of the remaining part is\\
\includegraphics[max width=\textwidth, alt={}, center]{d02047a7-2e53-46f4-95bc-7a4508088779-1_186_186_2211_1560}\\
A. $\frac { 1 } { 8 }$\\
B. $\frac { 1 } { 7 }$\\
C. $\frac { 1 } { 6 }$\\
D. $\frac { 1 } { 5 }$