\( A, B \) and \( C \) are three non-empty sets. If \( A \subset B \) and \( B \subset C \), the...

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\( A, B \) and \( C \) are three non-empty sets. If \( A \subset B \) and \( B \subset C \), then which of the is true?
(A) \( B-A=C-B \)
(B) \( A \cap B \cap C=B \)
(C) \( A \cup B=B \cup C \)
(D) \( A \cup B \cup C=A \)
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