Visitor Visa - B2

Hello All,

I got my visitor visa B2 rejected unfortunately under (214b) section,I need your help to get across it next time.

I am working in a software company here and my plan is to visit to my sister and brother-in-law place in month of september with my parents.

My parents got stamped their visa but mine got rejected .

Interview Details:-

VO-Where are you going, why,to whom and for how many days?
ME-I told

VO-What are you doing?
ME-Told

VO-Your marital status
ME-Single,age25

VO-Annual INcome
ME-3.25 LPA

VO-Going out of india for the first time
ME-Yes

VO-Sorry to inform you that this time you are not eligible to get USA visa,You can apply again.
ME-I asked sir what's the specific reason,He gave me a letter saying rejection under 214B section.

He didn't asked for a single document no DS-160 nothing only passport.

I have applied again for the interview and schedule in next week.

I am having questions like:-
-Is it the salary and marital status concern?
-What should i tell them next time,how to present ?
-What all points i should avoid?
-What do you all think the reason behind this rejection?

I need your help to get across it and at the earliest.

Thanks.