Incorrect Answer in practice test

There seems to be issue in one question. Please advise.

Option B and C are exactly the same. Please let me know what am i missing in it.

Exactly. And this why C cannot be added.

A cannot be inserted because _id:1 exists.
B can be inserted because _id:5 does not exists.
C cannot be inserted because once B is inserted _id:5 exists.
D can be added because _id:6 does not exists.


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