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The following sequence of operations is performed on a stack:

$PUSH (10), PUSH (20), POP, PUSH (10), PUSH (20), POP, POP, POP, PUSH (20), POP$

The sequence of values popped out is

1. $20,10,20,10,20$
2. $20,20,10,10,20$
3. $10,20,20,10,20$
4. $20,20,10,20,10$

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Let us try something different when you read the word pop then delete the last pushed element and print it. Now, delete the push word which we have already executed. Now, go on from left to right and do the same.

So, output will be $20, 20, 10, 10, 20$.

Nothing to explain. It will be B.
Just simple push pop operation option B

20 20 10 10 20