Hey Team,
I was taking practicing the exam and I found this question bit trick. I noticed option D has syntax error at the end (attached screenshot) while also had same options for B & C ( I cannot see any difference, excuse if I am missing something) so select one of them. The result summary caught me by surprise.
Can you please clarify if I am missing something and if not could please fix it so that it helps next folks who may take this free practice questionnaire. 
There is no difference between the 2 documents.
But when you try to insert the document with _id:5 from C, _id:5 already exists in the collection because it was added with B.
Okay, I misunderstood the format of question, I assumed that both are same so if I select anyone of them I will right but from your response it appears that this question or any questions during exam I must assume these options are executed in sequence and if executed in sequence which one succeeds! 
BTW, there was weird behaviour too while selecting any one of them, the other was automatically selected. Did not capture GIF as I was in the middle of practicing. Probably some glitch. 
I agree with Steeve. But still, it is tricky because the last option has a small error, since there is a quotation mark missing, i.e., ‘Orange’ instead of 'Orange .
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