question_answer

For any two non-empty sets P and Q, if \[P-Q=P\] and \[Q-P=Q,\] then _______.

A)  \[(P\cup Q)'=\phi \]                   

B)  \[P\cap Q=\phi \]

C)  \[P\subset Q\]               

D)  \[Q\subset P\]

E)  None of these