Doubt from Carbylamine test

A positive carbylamine test is given by ;
A) N, N-dimethylaniline
B) 2, 6-dimethylaniline
C) N-methyl-o-methylaniline
D) p-methylbenzylaniline
Try this.
(Note-- it's single correct answer question and also Give reason for ur answer like if option A then why not B,C,D)
Thanks.

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Sorry original question is this
A positive carbylamine test is given by ;
A) N, N-dimethylaniline
B) 2, 6-dimethylaniline
C) N-methyl-o-methylaniline
D) p-methylbenzylamine
@Shaquib sir
Otherwise question will be very simple. :smile:

What is difference between these two questions.it seem like same

Option 4 is different
In 1st post it was aniline (and that was a typo ) but now it's amine
Structure will be different and it will also be 1°

Then answer will be B,D

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That's why I have written in note in #1 that it's single correct answer and it's answer is only option D

Is there any answer misprint I mean how it can be possible.
Or is there any steric hindrance in option B.