Pravesh, Quila, Roshesh, Smitha, Tanaav, Urus, Vihaaz and Wahaab are all sitting on a horizontal desk and with each of them facing the same side.
Further, it is known that :
Pravesh is fourth to the right of Tanaav ;
Wahaab is second to the right of Smitha ;
Roshesh and Urus are at the two extreme and their immediate neighbors are either Quila and Tanaav ;
Wahaab is the immediate to the left of Pravesh and Pravesh is on one of the immediate sides of Quila ;
Determine as to who are the immediate neighbors of Wahaab ?

Roshesh and Urus are at the two extremes and their immediate neighbours are either Quila and Tanaav. 

It is given that, Pravesh is fourth to the right of Tanaav. It means that Tanaav can't be the neighbour of a person who is at the extreme right.

So, two cases can be formed. 

Case 1: Roshesh is at the immediate left and Urus is at the immediate right. 

Now, Quila and Tanaav will be their immediate neighbours of Urus and Roshesh respectively and Pravesh will be fourth to the right of Tannav. 

Required arrangement: (R, T, , , , P, Q, U) 

It is given that, Wahab is the immediate left of Pravesh and Wahab is second to the right of Smitha. 

Required arrangement: (R, T, S, , W, P, Q, U)

Now, only one place is left and it will be allotted to Vihaaz. 

Final arrangement: (R, T, S, V, W, P, Q, U)

Case 2: Roshesh is at the immediate right and Urus is at the immediate left. 

Now, Quila and Tanaav will be their immediate neighbours of Roshesh and Urus respectively and Pravesh will be fourth to the right of Tannav. 

Required arrangement: (U, T, , , , P, Q, R)

It is given that, Wahab is the immediate left of Pravesh and Wahab is second to the right of Smitha.

Required arrangement: (U, T, S, , W, P, Q, R)

Now, only one place is left and it will be allotted to Vihaaz.

Final arrangement: (U, T, S, V, W, P, Q, R)

Hence, Vihaaz and Pravesh are the immediate neighbours of Wahaab. 

Option B.