、已知集合<Object: word/embeddings/oleObject45.bin>，集合<Object: word/embeddings/oleObject46.bin>，则<Object: word/embeddings/oleObject47.bin>（ ）。
A.A．<Object: word/embeddings/oleObject48.bin> B.<Object: word/embeddings/oleObject49.bin> C.<Object: word/embeddings/oleObject50.bin> D. <Object: word/embeddings/oleObject51.bin>
正确答案是C