Đáp án C
Ta có
S Q P C N = S A B C D − S A B N Q − S Δ P Q D = S A B C D − 1 2 S A B C D − 1 8 S A B C D = 3 8 S A B C D .
Khi đó
V M . Q P C N = 1 3 . d M ; A B C D . S Q P C N = 1 3 . 1 2 . d S ; A B C D . 3 8 . S A B C D = 3 16 . 1 3 . d S ; A B C D . S A B C D = 3 16 . V 0 .
Vậy V = 3 16 V 0 .