Visitor Visa - B2

hi Dear Friends.......he had interview on 17/11/2015 at 9:00 AM ...delhi
Please help and guide my friend about 214-B refusal...?

1. my friend age-26
2. Unmarried
3. Doing job in University
4. Annual Salary Rs.150000
5. he has employment letter,leave sanction letter,period of job,last 4 months salary slips.
6. he visited already 3 cuntries
7. bank balance in his account Rs. 456973.
8. his father paying for his trip
9. father land documents
10. father land annual income approx.. Rs. 300000

the Vo asked him few questions. that is:
1. why do you want to go US.?
2. What do you do..?
3.do you have any known in us.?
4. have you traveled internationally before.?
5. which Countries.?

Then VO said..sorry our rules are very strict..i can't give you visa this time..you can reapply..thank you...

please frnds tell me about what's wrong with him...

please give him some advice.suggestion..through comments ...may be it will help him a lot..

Thanx a lot to all of you...!!