As you already know , While submitting objective type interview questions there are 3 answers which are to be given and are mandatory and the 4th option is optional.
But when a user submits only 3 answers for a question , this is how it is getting displayed ..
The fourth option is vacant.
My suggestion is either making 4 options as mandatory or when ever a user submits only 3 options do not show that ( 4. ) after posting.
Hope you got my point. This is what i felt .
If you feel this is fine with old process continue with it.
Kindly respond me with your reply !!!!