The sentence, I don't know where is it, represents an error in word order.

Question

1. probably where often formed a question.
2. probably because a noun clause was not recognized
My answer answer 1 & 2 are correct statements

Answer 1

2 is not correct. There's no noun clause there.

Answer 2

No, wait.

Answer 3

2 is correct; 1 is incorrect.

Answer 4

Hmmm, there's an indirect question in there, but no direct question. The indirect question is the noun clause.