1. Option: 3

2. Option: 1

3. Option: 2

4. Option: 1

**Explanation (1 to 4):**

X,U,Z are at ends of a triangle so they can be at any of b,c,f,g intersections.

Now X cannot be at g since he sees only 2 people.

UZV have to be in a straight line and x sees only U and z thus

X must be at b, V at e, Z at f, U at g.

Since Y can see W and W cannot see either V or Z thus

Y must be at k and W must be at at l.

– V –

X Z –

– U Y

– – W

Now all questions can be answered.