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17. Every painting hanging in the Hoular Gallery is by a French painter. No painting in the Hoular Gallery is by a Vorticist. Only Vorticists use acrylic monochromes in their works.
If the information above is true, which of the following must also be true?
(A) No French painters are Vorticists.
(B) All Vorticists use acrylic monochromes in their works.
(C) Some French painters do not use acrylic monochromes in their works.
(D) No French painters use acrylic monochromes in their works.（C）
(E) All French painters who use acrylics use acrylic monochromes in their works.
这个C怎么推出来的呢？指教！
H Gallery paining ---> French painter
No H Gallery paining ----> Vorticist ---> acrylic monochromes, then? | 
