question_answer

If \[A\subseteq B,\]then \[B\cup A\]is equal to:

A) \[B\cap A\]                           

B)  A                           

C)  B                            

D)         none of these

Correct Answer: C

Solution :

Since, it is given that \[A\subseteq B.\] It is clear from the figure that \[A\cup B=B.\]