Not a bad question. Just a bit too easy.
I can't imagine how anyone could select the answer 4,5,6 because even if they mistakenly look at the select list instead of the inserted data the only column named id in the select list is the id column from deleted, which contains the values 1,2,3. Maybe if the id column of define had been declared as "id id INT IDENTITY(4,1)" instead of "id id INT IDENTITY(1,1)" there would have been a better chance of people erroneously selecting the wrong answer 4,5,6. Only 3% of people have selected 4,5,6 so far, and I suspect that proportion will not increase as more people answer - perhaps it will decrease.
I suppose some might go for the "error" answer if they think that "define" is a reserved word that would need to be quoted when used as a table name, but I can't think of any T-SQL syntax that uses "define" in a way that would require it to be a reserved word so I don't know why anyone would think that. But 22% so have have thought that (or derampt up some other imaginary error).
If it weren't for the fact that 22% of answers so far are "error" I would be predicting a high 90s correct answer rate for this one.